Note 1. Nature of Operations and Basis of Presentation

Cerus Corporation (the “Company”) was incorporated in September 1991, and is developing and commercializing the INTERCEPT Blood System, which is designed to enhance the safety of blood components through pathogen inactivation. The Company has worldwide commercialization rights for the INTERCEPT Blood System for platelets, plasma and red blood cells.

The Company sells its INTERCEPT platelet and plasma systems in Europe, the Commonwealth of Independent States (“CIS”) countries, the Middle East and selected countries in other regions around the world. The Company conducts significant research, development, testing and regulatory compliance activities on its product candidates that, together with anticipated selling, general, and administrative expenses, are expected to result in substantial additional losses, and the Company may need to adjust its operating plans and programs based on the availability of cash resources. The Company’s ability to achieve a profitable level of operations will depend on successfully completing development, obtaining additional regulatory approvals and achieving widespread market acceptance of its products. There can be no assurance that the Company will ever achieve a profitable level of operations.

Note 2. Summary of Significant Accounting Policies

Principles of Consolidation

The accompanying consolidated financial statements include those of Cerus Corporation and its subsidiary, Cerus Europe B.V. (collectively hereinafter “Cerus” or the “Company”) after elimination of all intercompany accounts and transactions. These consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”).

Use of Estimates

The preparation of financial statements requires management to make estimates, assumptions and judgments that affect the reported amounts of assets, liabilities, revenue and expenses, and related disclosures of contingent assets and liabilities. On an ongoing basis, the Company evaluates its estimates, including those related to revenue recognition, inventory valuation, certain accrued liabilities, valuation and impairment of purchased intangibles and goodwill, valuation of warrants, valuation of stock options under share-based payments, valuation allowance of its deferred tax assets and uncertain income tax positions. The Company basis its estimates on historical experience and on various other assumptions that the Company believes to be reasonable under the circumstances, the results of which form its basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from those estimates under different assumptions or conditions.

Reclassifications

Certain reclassifications have been made to prior period reported amounts to conform to the current period presentations. Previously the Company had presented its provision for income taxes as a component of other income (expense) , net on the Consolidated Statements of Operations. The Company has reclassified the provision for income taxes to a separate line item in the Consolidated Statements of Operations, and as presented in Note 17 and 19 to the Consolidated Financial Statements. This reclassification had no impact on net loss, total assets or total stockholders’ equity.

Revenue

The Company recognizes revenue in accordance with ASC Topic 605-25, “Revenue Recognition—Arrangements with Multiple Deliverables,” as applicable. Revenue is recognized when (i) persuasive evidence of an agreement exists; (ii) services have been rendered or product has been delivered; (iii) pricing is fixed or determinable; and (iv) collection is reasonably assured. The Company’s main sources of revenues for the years ended December 31, 2012, 2011 and 2010 were product revenue from sales of the INTERCEPT Blood System for platelets and plasma (“platelet and plasma systems”) and United States government grants and awards.

Revenue related to product sales is generally recognized when the Company fulfills its obligations for each element of an agreement. For all sales of the Company’s INTERCEPT Blood System products, the Company uses a binding purchase order and signed sales contract as evidence of a written agreement. The Company sells its platelet and plasma systems directly to blood banks, hospitals, universities, government agencies, as well as to distributors in certain regions. Generally, the Company’s contracts with its customers do not provide for open return rights, except within a reasonable time after receipt of goods in the case of defective or non-conforming product. Deliverables and the units of accounting vary according to the provisions of each purchase order or sales contract. For revenue arrangements with multiple elements, the Company determines whether the delivered elements meet the criteria as separate units of accounting. Such criteria require that the deliverable have stand-alone value to the customer and that if a general right of return exists relative to the delivered item, delivery or performance of the undelivered item(s) is considered probable and substantially in the control of the Company. Once the Company determines if the deliverable meets the criteria for a separate unit of accounting, the Company must determine how the consideration should be allocated between the deliverables and how the separate units of accounting should be recognized as revenue. Consideration received is allocated to elements that are identified as discrete units of accounting based on the best estimated selling price. The Company has determined that vendor specific objective evidence is not discernible due to the Company’s limited history of selling its products and variability in its pricing across the regions into which it sells its products. Since the Company’s products are novel and unique and are not sold by others, third-party evidence of selling price is unavailable.

At both December 31, 2012 and 2011, the Company had $0.1 million of short-term deferred revenue on its consolidated balance sheets related to future performance obligations. Freight costs charged to customers are recorded as a component of revenue under ASC Topic 605, “Accounting for Shipping and Handling Fees and Costs.” Value-added-taxes (“VAT”) that the Company invoices to its customers and remits to governments are recorded on a net basis, which excludes such VAT from product revenue.

Revenue related to the cost reimbursement provisions under development contracts or United States government grants was recognized as the costs on the projects are incurred. The Company has received certain United States government grants and contracts that support research in defined research projects. These grants generally have provided for reimbursement of approved costs incurred as defined in the various grants.

Research and Development Expenses

In accordance with ASC Topic 730, “Accounting for Research and Development Expenses,” research and development expenses are charged to expense when incurred, including cost incurred under each grant that has been awarded to the Company by the United States government or development contracts. Research and development expenses include salaries and related expenses for scientific personnel, payments to consultants, supplies and chemicals used in in-house laboratories, costs of research and development facilities, depreciation of equipment and external contract research expenses, including clinical trials, preclinical safety studies, other laboratory studies, process development and product manufacturing for research use.

The Company’s use of estimates in recording accrued liabilities for research and development activities (see “Use of Estimates” above) affects the amounts of research and development expenses recorded and revenue recorded from development funding and government grants and collaborative agreements. Actual results may differ from those estimates under different assumptions or conditions.

Cash Equivalents

The Company considers all highly liquid investments with original maturities of three months or less from the date of purchase to be classified as cash equivalents. These investments primarily consist of money market instruments, and are classified as available-for-sale.

Short-Term Investments

Investments with original maturities of greater than three months but less than one year from the date of purchase as well as available-for-sale investments with original maturities of greater than one year from the date of purchase, which included United States government agency securities, were classified as short-term investments. In accordance with ASC Topic 320, “Accounting for Certain Investments in Debt and Equity Securities,” the Company classified all debt securities as available-for-sale at the time of purchase and reevaluates such designation as of each balance sheet date. Available-for-sale securities are carried at estimated fair value. Unrealized gains and losses derived by changes in the estimated fair value of available-for-sale securities were recorded in “Net unrealized gains (losses) on available-for-sale securities, net of taxes” on the Company’s consolidated statements of comprehensive loss. Realized gains and losses from the sale or maturity of available-for-sale investments were recorded in “Other income, net” on the Company’s consolidated statements of operations. The cost of securities sold was based on the specific identification method. The Company reported the amortization of any premium and accretion of any discount resulting from the purchase of debt securities as a component of interest income.

The Company also reviewed all of its marketable securities on a regular basis to evaluate whether any security has experienced an other-than-temporary decline in fair value.

Restricted Cash

The Company holds a certificate of deposit with a domestic bank for any potential decommissioning resulting from the Company’s possession of radioactive material. The certificate of deposit is held to satisfy the financial surety requirements of the California Department of Health Services and is recorded in “Restricted cash” on the Company’s consolidated balance sheets.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash, cash equivalents and accounts receivable.

Pursuant to the Company’s investment policy, substantially all of the Company’s cash and cash equivalents are maintained at a major financial institution in the United States of high credit standing, which at times, may exceed federally insured limits. The Company has not experienced any losses in its cash accounts and believes it not exposed to any significant risk.

Concentrations of credit risk with respect to trade receivables exist. However, in connection with the Company’s revolving line of credit, as discussed in Note 11 in the Notes to Consolidated Financial Statements, the Company purchased a credit insurance policy that mitigates some of its credit risk, as the policy will pay either the Company or its lender on eligible claims filed on its outstanding receivables. On a regular basis, including at the time of sale, the Company performs credit evaluations of its customers. Generally, the Company does not require collateral from its customers to secure accounts receivable. To the extent that the Company determines specific invoices or customer accounts may be uncollectible, the Company reserves against the accounts receivable on its consolidated balance sheets and records a charge on its consolidated statements of operations.

The Company had three customers and two customers that accounted for more than 10% of the Company’s outstanding trade receivables at December 31, 2012 and 2011, respectively. These customers cumulatively represented approximately 59% and 58% of the Company’s outstanding trade receivables at December 31, 2012 and 2011, respectively. To date, the Company has not experienced collection difficulties from these customers.

Inventories

At December 31, 2012 and 2011, inventory consisted of work-in-process and finished goods only. Finished goods include INTERCEPT disposable kits, UVA illumination devices (“illuminators”), and certain replacement parts for the illuminators. Platelet and plasma systems’ disposable kits generally have a two-year life from the date of manufacture. Illuminators and replacement parts do not have regulated expiration dates. Work-in-process includes certain components that are manufactured over a protracted length of time, which can exceed one year, before being incorporated and assembled by Fresenius Kabi AG (“Fresenius”) into the finished INTERCEPT disposable kits. Fresenius is the successor-in-interest to Fenwal, Inc., or Fenwal, and Baxter International, Inc., or Baxter, under certain agreements which arose from the sale of the transfusion therapies division of Baxter in 2007 to Fenwal. Fenwal was recently acquired by Fresenius, which assumed Fenwal’s rights and obligations under these certain agreements, including the Company’s manufacturing and supply agreement with Fenwal. In these footnotes references to Fresenius include references to its predecessors-in-interest. The Company maintains an inventory balance based on its current sales projections, and at each reporting period, the Company evaluates whether its work-in-process inventory would be consumed for production of finished units in order to sell to existing and prospective customers within the next twelve-month period. It is not customary for the Company’s production cycle for inventory to exceed twelve months. Instead, the Company uses its best judgment to factor in lead times for the production of its finished units to meet the Company’s current demands. If actual results differ from those estimates, work-in-process inventory could potentially accumulate for periods exceeding one year. At December 31, 2012 and 2011, the Company classified its work-in-process inventory as a current asset on its consolidated balance sheets based on its evaluation that the work-in-process inventory would be consumed for production and subsequently sold within each respective subsequent twelve-month period.

Inventory is recorded at the lower of cost, determined on a first-in, first-out basis, or market value. The Company uses significant judgment to analyze and determine if the composition of its inventory is obsolete, slow-moving or unsalable and frequently reviews such determinations. Generally, the Company writes-down specifically identified unusable, obsolete, slow-moving, or known unsalable inventory that has no alternative use to net realizable value in the period that it is first recognized by using a number of factors including product expiration dates, open and unfulfilled orders, and sales forecasts. Any write-down of its inventory to net realizable value establishes a new cost basis and will be maintained even if certain circumstances suggest that the inventory is recoverable in subsequent periods. Costs associated with the write-down of inventory are recorded in “Cost of product revenue” on the Company’s consolidated statements of operations. At December 31, 2012 and 2011, the Company had $0.3 million and $0.6 million, respectively, reserved for potential obsolete, expiring or unsalable product. At December 31, 2012, the Company also wrote-down the value of certain unsalable inventory of $1.7 million for which the Company has an offsetting warranty claim against Fresenius. See below in Note 2 in the Notes to Consolidated Financial Statements under “Guarantee and Indemnification Arrangements” and Note 16 in the Notes to Consolidated Financial Statements for further information regarding the Company’s warranty claim against Fresenius.

Property and Equipment, net

Property and equipment is comprised of furniture, equipment, information technology hardware and software and is recorded at cost. At the time the property and equipment is ready for its intended use, it is depreciated on a straight-line basis over the estimated useful lives of the assets (generally three to five years). Leasehold improvements are amortized on a straight-line basis over the shorter of the lease term or the estimated useful lives of the improvements.

Goodwill and Intangible Assets, net

Additions to goodwill and intangible assets, net are derived at the time of a business acquisition, in which the Company assigns the total consideration transferred to the acquired assets based on each asset’s fair value and any residual amount becomes goodwill, an indefinite life intangible asset. Intangible assets, net, which include a license for the right to commercialize the INTERCEPT Blood System in Asia, are subject to ratable amortization over the estimated useful life of ten years. The amortization of the Company’s intangible assets, net, is recorded in “Amortization of intangible assets” on the Company’s consolidated statements of operations.

Goodwill is not amortized but instead is subject to an impairment test performed on an annual basis, or more frequently if events or changes in circumstances indicate that goodwill may be impaired. Such impairment analysis is performed on August 31 of each fiscal year, or more frequently if indicators of impairment exist. Effective January 1, 2012, the test for goodwill impairment may be assessed using qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than the carrying amount. If the Company determines that it is more likely than not that the fair value of a reporting unit is less than the carrying amount, the Company must then proceed with performing the quantitative two-step process to test goodwill for impairment; otherwise, goodwill is not considered impaired and no further testing is warranted. The Company may choose not to perform the qualitative assessment to test goodwill for impairment and proceed directly to the quantitative two-step process; however, the Company may revert to the qualitative assessment to test goodwill for impairment in any subsequent period. The first step of the two-step process compares the fair value of each reporting unit with its respective carrying amount, including goodwill. The Company has determined that it operates in one reporting unit and estimates the fair value of its one reporting unit using the enterprise approach under which it considers the quoted market capitalization of the Company as reported on the Nasdaq Global Market. The Company considers quoted market prices that are available in active markets to be the best evidence of fair value. The Company also considers other factors, which include future forecasted results, the economic environment and overall market conditions. If the fair value of the reporting unit exceeds its carrying amount, goodwill of the reporting unit is not considered impaired and, therefore, the second step of the impairment test is unnecessary. The second step of the two-step process, which is used to measure the amount of impairment loss, compares the implied fair value of each reporting unit’s goodwill with the respective carrying amount of that goodwill. If the carrying amount of the reporting unit’s goodwill exceeds the implied fair value of that goodwill, an impairment loss is recognized in an amount equal to that excess.

The Company performs an impairment test on its intangible assets, in accordance ASC Topic 360-10, “Property, Plant and Equipment,” if certain events or changes in circumstances occur which indicate that the carrying amounts of its intangible assets may not be recoverable. If the intangible assets are not recoverable, an impairment loss would be recognized by the Company based on the excess amount of the carrying value of the intangible assets over its fair value. For further details regarding the impairment analysis, reference is made to the section below under “Long-lived Assets.” Also, see Note 8 in the Notes to Consolidated Financial Statements for further information regarding the Company’s impairment analysis and the valuation of goodwill and intangible assets, net.

Long-lived Assets

The Company evaluates its long-lived assets for impairment by continually monitoring events and changes in circumstances that could indicate carrying amounts of its long-lived assets may not be recoverable. When such events or changes in circumstances occur, the Company assesses recoverability by determining whether the carrying value of such assets will be recovered through the undiscounted expected future cash flows. If the expected undiscounted future cash flows are less than the carrying amount of these assets, the Company then measures the amount of the impairment loss based on the excess of the carrying amount over the fair value of the assets. The Company did not recognize impairment charges related to its long-lived assets during the years ended December 31, 2012, 2011 and 2010.

Foreign Currency Remeasurement

The functional currency of the Company’s foreign subsidiary is the United States dollar. Monetary assets and liabilities denominated in foreign currencies are remeasured in United States dollars using the exchange rates at the balance sheet date. Non-monetary assets and liabilities denominated in foreign currencies are remeasured in United States dollars using historical exchange rates. Monetary revenues and expenses are remeasured using average exchange rates prevailing during the period. Remeasurements are recorded in the Company’s consolidated statements of operations. The Company recorded foreign currency losses of $0.1 million, $0.5 million and $0.8 million during the years ended December 31, 2012, 2011 and 2010, respectively.

Stock-Based Compensation

The Company accounts for stock-based compensation in accordance with ASC Topic 718, “Compensation—Stock Compensation.” Stock-based compensation expense is measured at the grant-date based on the fair value of the award and is recognized as expense on a straight-line basis over the requisite service period, which is the vesting period, and is adjusted for estimated forfeitures. To the extent that stock options contain performance criteria for vesting, stock-based compensation is recognized once the performance criteria are probable of being achieved.

For stock-based awards issued to non-employees, the Company follows ASC Topic 505-50, “Equity Based Payment to Non-Employees” and considers the measurement date at which the fair value of the stock-based award is measured to be the earlier of (i) the date at which a commitment for performance by the grantee to earn the equity instrument is reached or (ii) the date at which the grantee’s performance is complete. The Company recognizes stock-based compensation expense for the fair value of the vested portion of the non-employee stock-based awards in its consolidated statements of operations.

See Note 14 in the Notes to Consolidated Financial Statements for further information regarding the Company’s stock-based compensation assumptions and expenses.

Warrant Liability

In August 2009, and November 2010, the Company issued warrants to purchase an aggregate of 2.4 million and 3.7 million shares of common stock, respectively. The material terms of the warrants were identical under each issuance except for the exercise price, date issued and expiration date. The Company classifies the warrants as a liability on its consolidated balance sheets as the warrants contain certain material terms which require the Company (or its successor) to purchase the warrants for cash in an amount equal to the value of the unexercised portion of the warrants in connection with certain change of control transactions. In addition, the Company may also be required to pay cash to a warrant holder under certain circumstances if the Company is unable to timely deliver the shares acquired upon warrant exercise to such holder.

The fair value of these outstanding warrants is calculated using a combination of the Black-Scholes model and/or binomial-lattice option-pricing model and is adjusted accordingly at each reporting period. Option-pricing models require that the Company uses significant assumptions and judgment to determine appropriate inputs to the model. Some of the assumptions that the Company relies on include the volatility of the Company’s stock over the life of the warrant, risk-free interest rate and the probability of a change of control occurring. The binomial-lattice option-pricing model also considers a certain number of share price movements and the probability of each outcome happening.

Changes resulting from the revaluation of warrants to fair value are recorded in “Revaluation of warrant liability” on the consolidated statements of operations. Upon the exercise or modification to remove the provisions which require the warrants to be treated as a liability, the fair value of the warrants will be reclassified from a liability to stockholders’ equity on the Company’s consolidated balance sheets and no further adjustment to the fair value would be made in subsequent periods.

See Note 13 in the Notes to Consolidated Financial Statements for further information regarding the Company’s valuation of warrant liability.

Income Taxes

The Company accounts for income taxes using an asset and liability approach in accordance with ASC Topic 740 “Accounting for Income Taxes.” Under this method, deferred tax assets and liabilities are determined based on differences between the financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. ASC Topic 740 requires derecognition of tax positions that do not have a greater than 50% likelihood of being recognized upon review by a taxing authority having full knowledge of all relevant information. Use of a valuation allowance as described in ASC Topic 740 is not an appropriate substitute for the derecognition of a tax position. The Company recognizes accrued interest and penalties related to unrecognized tax benefits in its income tax expense. To date, the Company has not recognized any interest and penalties in its consolidated statements of operations, nor has its accrued for or made payments for interest and penalties. The Company had no unrecognized tax benefits as of December 31, 2012 and 2011. The Company continues to carry a full valuation allowance on all of its deferred tax assets. Although the Company believes it more likely than not that a taxing authority would agree with its current tax positions, there can be no assurance that the tax positions the Company has taken will be substantiated by a taxing authority if reviewed. The Company’s tax years 1998 through 2012 remain subject to examination by the taxing jurisdictions due to unutilized net operating losses and research credits.

Net Loss Per Common Share

Basic net loss per common share is computed by dividing net loss by the weighted average number of common shares outstanding for the period. Diluted net loss per common share gives effect to all potentially dilutive common shares outstanding for the period. The potentially dilutive securities include stock options, employee stock purchase plan rights, warrants and restricted stock units, which are calculated using the treasury stock method, and convertible preferred stock, which is calculated using the if-converted method. Diluted net loss per common share also gives effect to potential adjustments to the numerator for changes resulting from the revaluation of warrants to fair value for the period, even if the Company is in a net loss position if the effect would result in more dilution.

Diluted net loss per common share used the same weighted average number of common shares outstanding for the years ended December 31, 2011 and 2010, as calculated for the basic net loss per common share as the inclusion of any potential dilutive securities would be anti-dilutive. In addition, certain potential dilutive securities were excluded from the dilution calculation for the years ended December 31, 2012, as their inclusion would have been anti-dilutive.

The following table sets forth the reconciliation of the numerator and denominator used in the computation of basic and diluted net loss per common share for the years ended December 31, 2012, 2011 and 2010 (in thousands, except per share amounts):

The table below presents common shares underlying stock options, employee stock purchase plan rights, warrants, restricted stock units and/or convertible preferred stock that were excluded from the calculation of the weighted average number of common shares outstanding used for the calculation of diluted net loss per common share. These were excluded from the calculation due to their anti-dilutive effect for the years ended December 31, 2012, 2011 and 2010 (shares in thousands):

Guarantee and Indemnification Arrangements

The Company recognizes the fair value for guarantee and indemnification arrangements issued or modified by the Company after December 31, 2002. In addition, the Company monitors the conditions that are subject to the guarantees and indemnifications in order to identify if a loss has occurred. If the Company determines it is probable that a loss has occurred, then any such estimable loss would be recognized under those guarantees and indemnifications. Some of the agreements that the Company is a party to contain provisions that indemnify the counter party from damages and costs resulting from claims that the Company’s technology infringes the intellectual property rights of a third party or claims that the sale or use of the Company’s products have caused personal injury or other damage or loss. The Company has not received any such requests for indemnification under these provisions and has not been required to make material payments pursuant to these provisions.

The Company generally provides for a one-year warranty on certain of its INTERCEPT blood-safety products covering defects in materials and workmanship. The Company accrues costs associated with warranty obligations when claims become known and are estimable. During the year ended December 31, 2012, the Company provided for and settled the claims for warranty obligations of $0.9 million related to replacement costs for certain of its products that the Company identified were defective or had the potential of being defective. Prior to this incident, there have been very few warranty costs incurred. As a result, the Company had not accrued for any potential future warranty costs at December 31, 2011. In addition, the Company believes that the defective products and those that had the potential of being defective identified during the year ended December 31, 2012 are isolated. Accordingly, the Company has not accrued for any other incremental potential future warranty costs for its products at December 31, 2012.

In connection with the warranty obligations provided for in relation to certain of its products during the year ended December 31, 2012, the Company filed a warranty claim against Fresenius, which Fresenius accepted. As a result, the Company recorded a current asset of $1.8 million on its consolidated balance sheets as of December 31, 2012 representing the full amount of the warranty claim against Fresenius as Fresenius will supply the Company with replacement products or credit notes for those defective or potentially defective products. The Company also wrote-down the value of certain unsalable inventory of $1.7 million related to these products as an offsetting warranty claim against Fresenius.

Fair Value of Financial Instruments

The Company applies the provisions of fair value relating to its financial assets and liabilities. The carrying amounts of accounts receivables, accounts payable, and other accrued liabilities approximate their fair value due to the relative short-term maturities. Based on the borrowing rates currently available to the Company for loans with similar terms, the Company believes the fair value of its debt approximates their carrying amounts. The Company measures and records certain financial assets and liabilities at fair value on a recurring basis, including its available-for-sale securities and warrant liability. The Company classifies instruments within Level 1 if quoted prices are available in active markets for identical assets, which include the Company’s cash accounts and its money market funds. The Company classifies instruments in Level 2 if the instruments are valued using observable inputs to quoted market prices, benchmark yields, reported trades, broker/dealer quotes or alternative pricing sources with reasonable levels of price transparency. These instruments include the Company’s available-for-sale securities related to United States government agencies. The available-for-sale securities are held by a custodian who obtains investment prices from a third party pricing provider that uses standard inputs (observable in the market) to models which vary by asset class. The Company classifies instruments in Level 3 if one or more significant inputs or significant value drivers are unobservable, Level 3 instruments include our warrant liability. The Company assesses any transfers among fair value measurement levels at the end of each reporting period.

See Note 4 and 13 in the Notes to Consolidated Financial Statements for further information regarding the Company’s valuation on financial instruments.

New Accounting Pronouncements

There have been no new accounting pronouncements issued during the year ended December 31, 2012, that are of significance, or potential significance, to the Company.

Note 3. BioOne Acquisition

On August 24, 2010, the Company acquired certain assets of BioOne, a privately held Japanese company established to develop technologies to improve the safety of blood products in Asia. The assets included the commercialization licenses that the Company had granted to BioOne for both the platelet and plasma systems, illuminators held as saleable inventory and demonstration illuminators. No liabilities were assumed.

As consideration for the acquired BioOne assets, the Company relinquished all shares of BioOne that had been held by the Company and issued 1,172,357 shares of the Company’s common stock to BioOne, of which 937,886 shares were issued at the close of the acquisition on August 24, 2010 and the remaining 234,471 shares were issued six months from the close of the acquisition date (February 25, 2011). The fair value of the Company’s common stock issued to BioOne on both dates was measured based on the closing price of the Company’s common stock on August 24, 2010, the date of acquisition, and was recorded as part of the total consideration.

The total value of the consideration provided was $3.7 million, of which approximately $3.4 million related to the fair value of the 1,172,357 shares of the Company’s common stock issued to BioOne and approximately $0.3 million related to the fair value of the Company’s non-controlling equity interest in BioOne relinquished as a result of the acquisition. The Company recognized a gain of $0.3 million, which represented the difference between the assumed fair value of the pre-acquisition non-controlling equity interest of BioOne and its carrying value. The Company carried its 13% investment in BioOne at zero as it had previously fully impaired its investment in BioOne. The assumed fair value of the pre-acquisition non-controlling equity interest was calculated by applying the Company’s 13% ownership investment in BioOne to the estimated fair value of the acquired assets (excluding goodwill) of $2.4 million as noted in the table below.

The Company also incurred acquisition related costs of $0.5 million, which were recorded as a component in “Acquisition related costs and impairment of long-term investment in related parties, net” on the consolidated statements of operations during the year ended December 31, 2010.

The BioOne acquisition was accounted for as an acquisition of a business in accordance with ASC Topic 805, “Business Combinations.” The Company determined the fair values of the acquired tangible and intangible assets based on their estimated fair values as of the acquisition date. The excess purchase price over the fair value of the net tangible and identifiable intangible assets was recorded as goodwill. A portion of the goodwill recognized is expected to be deductible for income tax purposes. The factors that contributed to the recognition of goodwill included securing buyer-specific synergies to increase revenue and profits through the commercialization of the INTERCEPT Blood System worldwide. By acquiring these commercialization rights in certain Asian countries, the Company was able to complete the global commercialization rights for its platelet and plasma systems.

The following table summarizes the fair value of assets acquired at the acquisition date (in thousands):

The commercialization rights in Asia represent the reacquisition of contractual rights originally granted to BioOne to market the Company’s products in certain countries in Asia. The contractual term of this original agreement was perpetual and the Company estimated the fair value of these acquired rights based on future expected cash flows to be generated over the expected life of the underlying technology. As a result, these intangible assets are subject to periodic amortization over the estimated useful life of ten years. The estimated fair value of inventory illuminators and demonstration illuminators was based on the expected sales price of the inventory, less reasonable profit margins.

The Company’s operating results included the impact of the BioOne acquisition beginning from the acquisition date. The pro forma disclosures for historical periods have not been presented as the impact of the BioOne acquisition was not significant to the results of operations of the Company since BioOne did not have any significant revenues or expenses due to their limited operating activities as a result of a deteriorating financial situation.

Note 4. Fair Value on Financial Instruments

The fair values of certain of the Company’s financial assets and liabilities were determined using the following inputs at December 31, 2012 (in thousands):

The fair values of certain of the Company’s financial assets and liabilities were determined using the following inputs at December 31, 2011 (in thousands):

A reconciliation of the beginning and ending balances for warrant liability using significant unobservable inputs (Level 3) from December 31, 2010 to December 31, 2012 was as follows (in thousands):

The Company did not have any transfers among fair value measurement levels during the years ended December 31, 2012 and 2011.

Note 5. Available-for-sale Securities

The following is a summary of available-for-sale securities at December 31, 2012 (in thousands):

The following is a summary of available-for-sale securities at December 31, 2011 (in thousands):

Available-for-sale securities at December 31, 2012 and 2011 consisted of the following by original contractual maturity (in thousands):

The maturities of certain short-term investments were estimated primarily based upon assumed prepayment features and credit enhancement characteristics.

The Company recorded minimal gross realized gains from the sale or maturity of available-for-sale investments during the year ended December 31, 2011 and did not record any gross realized gains from the sale or maturity of available-for-sale investments during the years ended December 31, 2012 and 2010. The Company recorded minimal gross realized losses from the sale or maturity of available-for-sale investments during the year ended December 31, 2010 and did not record any gross realized losses during the years ended December 31, 2012 and 2011. The Company did not record losses on investments experiencing an other-than-temporary decline in fair value during the years ended December 31, 2012, 2011 and 2010.

Note 6. Inventories

Inventories at December 31, 2012 and 2011 consisted of the following (in thousands):

Note 7. Property and Equipment, net

Property and equipment, net at December 31, 2012 and 2011 consisted of the following (in thousands):

Depreciation and amortization expense related to property and equipment, net was $0.4 million, $0.6 million and $0.6 million for the years ended December 31, 2012, 2011 and 2010, respectively.

Note 8. Goodwill and Intangible Assets, net

Goodwill

During the year ended December 31, 2012, the Company did not dispose of or recognize additional goodwill. On August 31, 2012, the Company performed its annual review of goodwill. As described in Note 2 above, the Company applied the enterprise approach by reviewing the quoted market capitalization of the Company as reported on the Nasdaq Global Market to calculate the fair value. In addition, the Company considered its future forecasted results, the economic environment and overall market conditions. As a result of the Company’s assessment that its fair value of the reporting unit exceeded its carrying amount, the Company determined that goodwill was not impaired. Accordingly, at both December 31, 2012 and 2011, the carrying amount of goodwill was $1.3 million.

Intangible Assets, net

The following is a summary of intangible assets, net at December 31, 2012 (in thousands):

The following is a summary of intangible assets, net at December 31, 2011 (in thousands):

The Company recognized $0.2 million in amortization expense related to intangible assets for each of the years ended December 31, 2012 and 2011. During the years ended December 31, 2012 and 2011, there were no impairment charges recognized related to the Company’s intangible assets.

At December 31, 2012, the expected annual amortization expense of the intangible assets, net is $0.2 million beginning with the year ending December 31, 2013 and each subsequent year thereafter through the year ending December 31, 2019, and $0.1 million for the year ending December 31, 2020.

Note 9. Long-Term Investments

In connection with the BioOne acquisition in August 2010, the Company relinquished all BioOne shares that the Company held as part of the consideration for certain of these assets and recognized a gain of $0.3 million during the year ended December 31, 2010, which represented the difference between the assumed fair value of the pre-acquisition non-controlling equity interest of BioOne and the carrying value. The Company also incurred acquisition related costs of $0.5 million during the year ended December 31, 2010.

See Note 3 in the Notes to Consolidated Financial Statements for further information regarding the Company’s acquisition and valuation of BioOne.

In connection with the agreements to license the immunotherapy technologies to Aduro BioTech (“Aduro”) in 2009, the Company received preferred shares of Aduro, a privately held company. Pursuant to these license agreements, the Company is eligible to receive a 1% royalty fee on any future sales resulting from the licensed technology. For the years ended December 31, 2012, 2011 and 2010, the Company has not received any royalty payments from Aduro pursuant to this agreement. As of December 31, 2012, the Company’s ownership in Aduro was less than 3% on a fully diluted basis. Since receiving preferred stock in Aduro, the Company has carried its investment in Aduro at zero in its consolidated balance sheet.

Note 10. Accrued Liabilities

Accrued liabilities at December 31, 2012 and 2011 consisted of the following (in thousands):

Note 11. Debt

Debt at December 31, 2012 consisted of the following (in thousands):

Debt at December 31, 2011 consisted of the following (in thousands):

Principal and interest payments on debt at December 31, 2012 are expected to be as follows for each of the following three years (in thousands):

2011 Growth Capital Facility

The Company entered into a loan and security agreement on September 30, 2011, as amended effective on December 13, 2011, and June 30, 2012, with Comerica Bank (“Comerica”) (collectively, the “Amended Credit Agreement”). The Amended Credit Agreement provides for an aggregate borrowing of up to $12.0 million, comprised of a growth capital loan of $5.0 million (“Growth Capital Loan”) and a formula based revolving line of credit (“RLOC”) of up to $7.0 million. The Company pledged all current and future assets, excluding its intellectual property and 35% of the Company’s investment in its subsidiary, Cerus Europe B.V., as security for borrowings under the Amended Credit Agreement.

Growth Capital Loan

Concurrent with the execution of the original loan and security agreement in September 2011, the Company borrowed $5.0 million under the Growth Capital Loan, substantially all of which was used to repay the Company’s prior debt with Oxford Finance Corporation (“Oxford”), with the remainder used for general corporate purposes. The Growth Capital Loan, which matures on September 30, 2015, bears a fixed interest rate of 6.37%, with interest–only payments due for the first twelve months, followed by equal principal and interest payments for the remaining 36 months.

In September 2011, the Company incurred a commitment fee of $40,000 and loan fees of $50,000, which were recorded as a discount to its Growth Capital Loan and are being amortized as a component of interest expense using the effective interest method over the term of the Growth Capital Loan (discount was based on an implied interest rate of 7.07%). The Company will also be required to make a final payment fee of 1% of the amounts drawn under Growth Capital Loan due on the earlier of (i) prepayment of the Growth Capital Loan or (ii) the maturity of the Growth Capital Loan. The final payment fee will be accreted to interest expense using the effective interest method over the life of the Growth Capital Loan upon draw.

Revolving Line of Credit

The Amended Credit Agreement also provides for a RLOC of up to $7.0 million (the “RLOC Loan Amount”). The amount available under the RLOC is limited to the lesser of (i) 80% of eligible trade receivables or (ii) the RLOC Loan Amount. At December 31, 2012 and 2011, the Company had $3.2 million and $2.3 million, respectively, outstanding under the RLOC. The Company is required to repay the principal drawn from the RLOC at the end of the RLOC term on June 30, 2014, or earlier if a portion or all of the outstanding RLOC exceeds the amount available under the RLOC. The RLOC bears a floating rate based on the lender’s prime rate plus 1.50%, with interest–only payments due each month. At both December 31, 2012 and 2011, the floating rate of the RLOC was at 4.75%. In September 2011, the Company incurred a commitment fee of $20,000. Upon amendment of the loan and security agreement in June 2012, the Company incurred another annual commitment fee of $20,000 and received a credit for the unused portion of the initial fee. The Company will incur a $20,000 commitment fee at each annual anniversary beginning June 30, 2013.

Compliance with Covenants

The Company is required to maintain compliance with certain customary and routine financial covenants under the Amended Credit Agreement, including maintaining a minimum cash balance of $2.5 million at Comerica and achieving minimum revenue levels, which are measured monthly based on a six-month trailing basis and must be at least 75% of the pre-established future projected revenues for the trailing six-month period. Non-compliance with the covenants could result in the principal of the note becoming due and payable. As of December 31, 2012, the Company was in compliance with the financial covenants as set forth in the Amended Credit Agreement.

2010 Growth Capital Facility

In March 2010, the Company entered into a growth capital facility agreement with Oxford and immediately borrowed and issued a senior secured note for $5.0 million. The note carried a fixed interest rate of 12.04%, with interest—only payments due for the first nine months and then equal principal and interest payments for an additional 30 months. In connection with the issuance of the note, the Company paid an upfront facility fee of $0.1 million and incurred closing costs of $0.1 million, which was recorded as a discount to the note and was amortized as a component of interest expense using the effective interest method over the term of the note (discount was based on an implied interest rate of 13.84%). In addition, the Company agreed to pay a $0.4 million closing fee upon maturity of the note, which was being accreted to interest expense using the effective interest method over the life of the note. For the year ended December 31, 2010, the Company also incurred a non-utilization fee of $0.1 million, which was recognized as an operating expense, as the Company had not drawn down on the additional $5.0 million available to be drawn between September 30, 2010 and December 31, 2010.

In March 2011, the Company amended its growth capital facility with Oxford, which extended the availability of borrowing an additional $5.0 million through September 30, 2011 without incurring additional upfront facility fees and modified the covenant compliance requirements. In September 2011, the Company repaid the outstanding balance of the debt owed to Oxford using the proceeds received from the Credit Agreement as discussed in further detail above. The Company also accelerated and expensed the remaining closing cost and fees of $0.2 million to interest expense during the year ended December 31, 2011.

Note 12. Commitments and Contingencies

Operating Leases

The Company leases its office facilities, located in Concord, California and Amersfoort, The Netherlands, and certain equipment under non-cancelable operating leases with initial terms in excess of one year that require the Company to pay operating costs, property taxes, insurance and maintenance. The operating leases expire at various dates through 2019, with certain of the leases providing for renewal options, provisions for adjusting future lease payments, which is based on the consumer price index and the right to terminate the lease early, which may occur as early as January 2015. The Company’s leased facilities qualify as operating leases under ASC Topic 840, “Leases” and as such, are not included on its consolidated balance sheets.

Future minimum non-cancelable lease payments under operating leases as of December 31, 2012 are as follows (in thousands):

Rent expense for office facilities was $0.6 million, $0.7 million and $0.9 million for the years ended December 31, 2012, 2011 and 2010, respectively.

Financed Leasehold Improvements

In December 2010, the Company financed $1.1 million of leasehold improvements. The Company pays for the financed leasehold improvements as a component of rent and is required to reimburse its landlord over the remaining life of the respective leases. If the Company exercises its right to early terminate the Concord California lease, which may occur as early as January 2015, the Company would be required to repay for any remaining portion of the landlord financed leasehold improvements at such time. At December 31, 2012, the Company had an outstanding liability of $0.8 million related to these leasehold improvements, of which $0.1 million was reflected in “Accrued liabilities” and $0.7 million was reflected in “Other non-current liabilities” on the Company’s consolidated balance sheets.

Purchase Commitments

The Company is party to agreements with certain providers for certain components of INTERCEPT Blood System which the Company purchases from third party manufacturers and supplies to Fresenius at no cost for use in manufacturing finished INTERCEPT disposable kits. Certain of these agreements require minimum purchase commitments from the Company. The Company has paid $7.2 million, $3.6 million and $0.9 million for goods under agreements which are subject to minimum purchase commitments during the years ended December 31, 2012, 2011 and 2010, respectively. As of December 31, 2012, the Company has future minimum purchase commitments under these agreements of $2.5 million for the year ending December 31, 2013 and less than $0.1 million for each subsequent year thereafter through December 31, 2015.

Note 13. Stockholders’ Equity

Series B Convertible Preferred Stock

In March 1999, the Company issued 3,327 shares of the Company’s Series B convertible preferred stock to Fresenius. The Series B convertible preferred stock had no voting rights, except with respect to the authorization of any class or series of stock having preference or priority over the Series B convertible preferred stock as to voting, liquidation or conversion or with respect to the determination of fair value of non-publicly traded shares received by the holder of Series B convertible preferred stock in the event of a liquidation, or except as required by Delaware law. At any time, the holder had the ability to convert each share of Series B convertible preferred stock into 100 shares of the Company’s common stock. The Company had the right to redeem the Series B convertible preferred stock prior to conversion for a payment of $9.5 million. In June 2012, Fresenius exercised its right to convert all 3,327 shares of the Company’s Series B convertible preferred stock. As a result, the Company issued 332,700 shares of its common stock to Fresenius and retired the outstanding Series B convertible preferred stock.

Common Stock and Associated Warrant Liability

In August 2009, the Company issued warrants to purchase 2.4 million shares of common stock, exercisable at an exercise price of $2.90 per share (“2009 Warrants”). The 2009 Warrants are exercisable for a period of five years from the issue date. The fair value on the date of issuance of the 2009 Warrants was determined to be $2.8 million using the Black-Scholes model and/or binomial-lattice option valuation model and applying the following assumptions: (i) a risk-free rate of 2.48%, (ii) an expected term of 5.0 years, (iii) no dividend yield and (iv) a volatility of 77%.

In November 2010, the Company received net proceeds of approximately $19.7 million, after deducting underwriting discounts and commissions and stock issuance costs of approximately $1.3 million, from an underwritten public offering of 7.4 million units. Each unit sold consisted of one share of common stock and a warrant to purchase 1/2 of a share of common stock. Each unit was sold for $2.85, resulting in the issuance of 7.4 million shares of common stock and warrants to purchase 3.7 million shares of common stock, exercisable at an exercise price of $3.20 per share (“2010 Warrants”). The warrants issued in November 2010 became exercisable on May 15, 2011 and are exercisable for a period of five years from the issue date. The fair value on the date of issuance of the 2010 Warrants was determined to be $5.8 million using the Black-Scholes model and/or binomial-lattice option valuation model and applying the following assumptions: (i) a risk-free rate of 1.23%, (ii) an expected term of 5.0 years, (iii) no dividend yield and (iv) a volatility of 85%.

The fair value of the 2009 Warrants and 2010 Warrants was recorded on the consolidated balance sheets as a liability pursuant to “Accounting for Derivative Instruments and Hedging Activities” and “Accounting for Certain Financial Instruments with Characteristics of Both Liabilities and Equity” Topics of ASC and will be adjusted to fair value at each financial reporting date thereafter until the earlier of exercise or modification to remove the provisions which require the warrants to be treated as a liability, at which time, these warrants would be reclassified into stockholders’ equity. The Company classified the 2009 Warrants and 2010 Warrants as a liability as these warrants contain certain provisions that, under certain circumstances, which may be out of the Company’s control, could require the Company to pay cash to settle the exercise of the warrants or may require the Company to redeem the warrants.

The fair value of the warrants at December 31, 2012 and 2011 consisted of the following (in thousands):

The fair value of the Company’s warrants was based on using the Black-Scholes model and/or binomial-lattice option valuation model and using the following assumptions at December 31, 2012 and 2011:

The Company recorded non-cash gains of $2.1 million, $0.5 million and less than $0.1 million during the years ended December 31, 2012, 2011, and 2010, respectively, in “Revaluation of warrant liability” on the consolidated statements of operations due to the changes in fair value of the warrants. Significant changes to the Company’s market price for its common stock will impact the implied and/or historical volatility used to fair value the warrants. As a result, any significant increases in the Company’s stock price will likely create an increase to the fair value of warrant liability. Similarly, any significant decreases in the Company’s stock price will likely create a decrease to the fair value of warrant liability. In June 2012, 2010 Warrants to purchase 5,084 shares of common stock were exercised. At December 31, 2011, no warrants had been exercised.

Sales Agreements

The Company entered into an At-The-Market Issuance Sales Agreement in June 2011, as amended in January 2012 and August 2012 (collectively, the “MLV Agreement”), with MLV & Co. LLC, formerly McNicoll, Lewis & Vlak LLC (“MLV”) that provides for the issuance and sale of shares of the Company’s common stock over the term of the MLV Agreement having an aggregate offering price of up to $20.0 million through MLV. Under the MLV Agreement, MLV acts as the Company’s sales agent and receives compensation based on an aggregate of 3% of the gross proceeds on the sale price per share of its common stock. The issuance and sale of these shares by the Company pursuant to the MLV Agreement are deemed an “at-the-market” offering and are registered under the Securities Act. During the year ended December 31, 2011, approximately 3.5 million shares of the Company’s common stock were sold under the MLV Agreement for aggregate net proceeds of $9.7 million. During the year ended December 31, 2012, the Company sold approximately 3.1 million additional shares of its common stock under the MLV Agreement for aggregate net proceeds of $9.5 million. At December 31, 2012, the Company had less than $0.1 million of common stock available to be sold under the MLV Agreement.

The Company also entered into a Controlled Equity Offering^SM Sales Agreement (the “Cantor Agreement”) in August 2012, with Cantor Fitzgerald & Co. (“Cantor”) that provides for the issuance and sale of shares of its common stock over the term of the Cantor Agreement having an aggregate offering price of up to $30.0 million through Cantor. Under the Cantor Agreement, Cantor also acts as the Company’s sales agent and receives compensation based on an aggregate of 2% of the gross proceeds on the sale price per share of its common stock. The issuance and sale of these shares by the Company pursuant to the Cantor Agreement are deemed an “at-the-market” offering and are registered under the Securities Act. During the year ended December 31, 2012, approximately 1.4 million shares of the Company’s common stock were sold under the Cantor Agreement for aggregate net proceeds of $4.3 million. At December 31, 2012, the Company had approximately $25.5 million of common stock available to be sold under the Cantor Agreement.

Stockholder Rights Plan

In October 2009, the Company’s Board of Directors adopted an amendment to its 1999 stockholder rights plan, commonly referred to as a “poison pill,” to reduce the exercise price, extend the expiration date and revise certain definitions under the plan. The stockholder rights plan is intended to deter hostile or coercive attempts to acquire the Company. The stockholder rights plan enables stockholders to acquire shares of the Company’s common stock, or the common stock of an acquirer, at a substantial discount to the public market price should any person or group acquire more than 15% of the Company’s common stock without the approval of the Board of Directors under certain circumstances. The Company has designated 250,000 shares of Series C Junior Participating preferred stock for issuance in connection with the stockholder rights plan.

Note 14. Stock-Based Compensation

Employee Stock Plans

Employee Stock Purchase Plan

The Company maintains an Employee Stock Purchase Plan (the “Purchase Plan”), which is intended to qualify as an employee stock purchase plan within the meaning of Section 423(b) of the Internal Revenue Code. Under the Purchase Plan, the Company’s Board of Directors may authorize participation by eligible employees, including officers, in periodic offerings. Although the Purchase Plan provides for an offering period to be no more than 27 months, the Company currently allows eligible employees to purchase shares of the Company’s common stock at the end of each six-month offering period at a purchase price equal to 85% of the lower of the fair market value per share on the start date of the offering period or the fair market value per share on the purchase date prior to 2012. Prior to June 6, 2012, the Purchase Plan, as amended by the Company’s stockholders, had authorized and provided for issuance an aggregate of 820,500 shares of common stock. On June 6, 2012, the stockholders approved a further amendment to the Purchase Plan to increase the aggregate number of shares of common stock authorized for issuance by 500,000 shares, such that the Purchase Plan has reserved for issuance an amount not to exceed 1,320,500 shares. At December 31, 2012, the Company had 581,879 shares available for future issuance.

2008 Equity Incentive Plan

The Company also maintains an equity compensation plan to provide long-term incentives for employees, contractors, and members of its Board of Directors. The Company currently grants equity awards from one plan, the 2008 Equity Incentive Plan (the “2008 Plan”). The 2008 Plan allows for the issuance of non-statutory and incentive stock options, restricted stock, restricted stock units, stock appreciation rights, other stock-related awards, and performance awards which may be settled in cash, stock, or other property. On June 1, 2011 and June 6, 2012, the stockholders approved amendments to the 2008 Plan (collectively the “Amended 2008 Plan”) which increased the aggregate number of shares of common stock authorized for issuance by 2,000,000 shares and 3,000,000 shares, respectively, such that the Amended 2008 Plan has reserved for issuance an amount not to exceed 13,540,940 shares. Awards under the 2008 Plan generally have a maximum term of 10 years from the date of the award. The 2008 Plan generally requires options to be granted at 100% of the fair market value of the Company’s common stock subject to the option on the date of grant and will generally vest over four years. Performance-based stock or cash awards granted under the Amended 2008 Plan are limited to either 500,000 shares of common stock or $1.0 million per recipient per calendar year. The attainment of any performance-based awards granted shall be conclusively determined by a committee designated by the Company’s Board of Directors. At December 31, 2012, 50,000 performance-based stock options were outstanding, of which 50,000 were granted during the year ended December 31, 2011.

1996 Equity Incentive Plan, 1998 Non-Officer Stock Option Plan, and 1999 Equity Incentive Plan

The Company continues to have equity awards outstanding under its previous stock plans: 1998 Non-Officer Stock Option Plan and 1999 Equity Incentive Plan (collectively, the “Prior Plans”) and 1996 Equity Incentive Plan (the “1996 Plan”). Equity awards issued under the Prior Plans and the 1996 Plan continues to adhere to the terms of those respective stock plans and no further options may be granted under those previous plans. However, at June 2, 2008, any shares that remained available for future grants under the Prior Plans became available for issuance under the 2008 Plan.

At December 31, 2012, the Company had an aggregate of approximately 12.9 million shares of its common stock remaining available for future issuance under the Amended 2008 Plan, the Prior Plans and the 1996 Plan, of which approximately 8.6 million shares were subject to outstanding options and other stock-based awards, and approximately 4.3 million shares were available for future issuance under the Amended 2008 Plan. The Company’s policy is to issue new shares of common stock upon the exercise of options.

Activity under the Company’s equity incentive plans related to stock options is set forth below (in thousands except weighted average exercise price):

Information regarding the Company’s stock options outstanding, stock options vested and expected to vest, and stock options exercisable at December 31, 2012, 2011 and 2010, was as follows (in thousands except weighted average exercise price and contractual term):