Description of Operations and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2012

Description of Operations and Summary of Significant Accounting Policies

Principles of Consolidation

Principles of Consolidation

        The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.

Use of Management's Estimates

Use of Management's Estimates

        The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates.

Segment Reporting

Segment Reporting

        The Company has determined that it operates in a single segment which is the discovery (research), development and commercialization of human therapeutics. Revenues are generated primarily from the Company's collaboration arrangements with GlaxoSmithKline plc (GSK), located in the United Kingdom, Astellas Pharma Inc. (Astellas) (through January 6, 2012), located in Japan, and Merck located in the United States. All long-lived assets, which were comprised of property and equipment, are maintained in the United States.

Cash and Cash Equivalents

Cash and Cash Equivalents

        The Company considers all highly liquid investments purchased with a maturity of three months or less on the date of purchase to be cash equivalents. Cash equivalents are carried at cost, which approximates fair value.

        Under certain lease agreements and letters of credit, the Company has pledged cash and cash equivalents as collateral. Restricted cash related to such agreements was $0.8 million as of December 31, 2012 and $0.9 million as of December 31, 2011.

Marketable Securities

Marketable Securities

        The Company's management determines the appropriate classification of its marketable securities, which consist of debt securities, at the time of purchase and reevaluates such designation at each balance sheet date. All of the marketable securities are classified as available-for-sale and carried at estimated fair values and reported in cash equivalents, short-term investments or long-term marketable securities. Unrealized gains and losses on available-for-sale securities are reported in the consolidated statements of comprehensive loss. Interest, amortization of purchase premiums and discounts, and realized gains and losses on sales of securities are included in interest and other income. The cost of securities sold is based on the specific identification method.

        The Company regularly reviews all of its investments for other-than-temporary declines in estimated fair value. The Company's review includes the consideration of the cause of the impairment, including the creditworthiness of the security issuers, the number of securities in an unrealized loss position, the severity and duration of the unrealized losses, whether the Company has the intent to sell the securities and whether it is more likely than not that the Company will be required to sell the securities before the recovery of their amortized cost basis. When the Company's management determines that the decline in estimated fair value of an investment is below the amortized cost basis and the decline is other-than-temporary, the Company reduces the carrying value of the security and records a loss for the amount of such decline.

Fair Value of Financial Instruments

Fair Value of Financial Instruments

        Financial instruments include cash equivalents, marketable securities, related party receivables, accounts payable, accrued liabilities and convertible subordinated notes. Marketable securities are carried at estimated fair value. The carrying value of cash equivalents, receivables from related party, accounts payable and accrued liabilities approximate their estimated fair value due to the relatively short nature of these instruments. Convertible subordinated notes are described in Note 7.

Concentration of Credit Risks

Concentration of Credit Risks

        The Company invests in a variety of financial instruments and, by its policy, limits the amount of credit exposure with any one issuer, industry or geographic area for investments other than instruments backed by the U.S. federal government.

Notes Receivable

Notes Receivable

        The Company provided loans to certain employees to assist them primarily with the purchase of a primary residence, which collateralizes the resulting loans. There was no interest receivable related to the loans as of December 31, 2012 and December 31, 2011. The outstanding loans have maturity dates ranging from January 2013 through May 2014.

Inventories

Inventories

        Inventories are stated at the lower of cost or market value. Inventories include VIBATIV® active pharmaceutical ingredient and other raw materials of $5.7 million and work-in-process of $1.8 million at December 31, 2012. Work-in-process consists of third party manufacturing and associated labor costs relating to the Company's personnel directly involved in the production process. VIBATIV® is a U.S. Food and Drug Administration (FDA) approved drug. If information becomes available that suggests the inventories may not be realizable, the Company may be required to expense a portion or all of the previously capitalized inventories.

Property and Equipment

Property and Equipment

        Property, equipment and leasehold improvements are stated at cost and depreciated using the straight-line method as follows:

Leasehold improvements	Shorter of remaining lease terms or useful life
Equipment, furniture and fixtures	5 - 7 years
Software and computer equipment	3 years

Capitalized Software

Capitalized Software

        The Company capitalizes certain costs related to direct material and service costs for software obtained for internal use. Capitalized software costs are depreciated over 3 years.

Impairment of Long-Lived Assets

Impairment of Long-Lived Assets

        Long-lived assets include property and equipment. The carrying value of long-lived assets is reviewed for impairment whenever events or changes in circumstances indicate that the asset may not be recoverable. An impairment loss is recognized when the total of estimated future cash flows expected to result from the use of the asset and its eventual disposition is less than its carrying amount.

Bonus Accruals

Bonus Accruals

        The Company has short-term bonus programs for eligible employees. Bonuses are determined based on various criteria, including the achievement of corporate, departmental and individual goals. Bonus accruals are estimated based on various factors, including target bonus percentages per level of employee and probability of achieving the goals upon which bonuses are based. The Company's management periodically reviews the progress made towards the goals under the bonus programs. As bonus accruals are dependent upon management's judgments of the likelihood of achieving the various goals, it is possible for bonus expense to vary significantly in future periods if changes occur in those management estimates.

        In 2011, the Company granted special long-term retention and incentive cash bonus awards to certain employees. The awards have dual triggers of vesting based upon the achievement of certain performance conditions over a six-year timeframe from 2011 through December 31, 2016 and continued employment. As of December 31, 2012, the Company's management determined that the achievement of the requisite performance conditions was not probable and, as a result, no compensation expense has been recognized.

Deferred Rent

Deferred Rent

        Deferred rent consists of the difference between cash payments and the recognition of rent expense on a straight-line basis for the buildings the Company occupies. Rent expense is being recognized ratably over the life of the leases. Because the Company's facility operating leases provide for rent increases over the terms of the leases, average annual rent expense during the first 1.5 years of the leases exceeded the Company's actual cash rent payments. Also included in deferred rent are lease incentives of $2.6 million as of December 31, 2012, which is being recognized ratably over the life of the leases.

Revenue Recognition

Revenue Recognition

        The Company's revenues are related primarily to its collaboration arrangements. The Company's arrangements provide for various types of payments to the Company, including non-refundable upfront fees, milestone and other contingent payments and royalty payments.

        Beginning in January 1, 2011, the Company accounts for new multiple element arrangements, such as license and development agreements in which a customer may purchase several deliverables, in accordance with Financial Accounting Standards Board (FASB) Subtopic ASC 605-25, "Multiple Element Arrangements". For new or materially amended multiple element arrangements, at the inception of the arrangement each deliverable within a multiple deliverable revenue arrangement is accounted for as a separate unit of accounting if both of the following criteria are met: (1) the delivered item or items have value to the customer on a standalone basis and (2) for an arrangement that includes a general right of return relative to the delivered item(s), delivery or performance of the undelivered item(s) is considered probable and substantially in the Company's control. The Company allocates revenue to each non-contingent element based on the relative selling price of each element. When applying the relative selling price method, the Company's management determines the selling price for each deliverable using vendor-specific objective evidence (VSOE) of selling price, if it exists, or third-party evidence (TPE) of selling price, if it exists. If neither VSOE nor TPE of selling price exist for a deliverable, the Company uses best estimated selling price for that deliverable. Revenue allocated to each element is then recognized based on when the basic four revenue recognition criteria are met for each element.

        For multiple-element arrangements entered into prior to January 1, 2011, the Company's management determined the deliverables under its collaboration agreements which did not meet the criteria to be considered for separate accounting units for the purposes of revenue recognition. As a result, the Company recognized revenue from non-refundable, upfront fees and development milestone payments ratably over the term of its performance under the agreements. These upfront or milestone payments received, pending recognition as revenue, are recorded as deferred revenue and are classified as a short-term or long-term liability on the Company's consolidated balance sheet and amortized over the estimated period of performance. The Company periodically reviews the estimated performance periods of its contracts based on the progress of its programs.

        Where a portion of non-refundable upfront fees or other payments received are allocated to continuing performance obligations under the terms of a collaboration agreement, they are be recorded as deferred revenue and recognized as revenue or as an accrued liability and recognized as a reduction of research and development expenses ratably over the term of its estimated performance period under the agreement. The Company's management determines the estimated performance periods and they are periodically reviewed based on the progress of the related program. The effect of any change made to an estimated performance period and therefore revenue recognized would occur on a prospective basis in the period that the change was made.

        Under certain collaboration arrangements, the Company has been reimbursed for a portion of its research and development expenses. These reimbursements have been reflected as a reduction of research and development expense in the Company's consolidated statements of operation, as the Company does not consider performing research and development services to be a part of its ongoing and central operations. Therefore, the reimbursement of research and developmental services and any amounts allocated to the Company's research and development services are recorded as a reduction of research and development expense.

        Amounts deferred under a collaboration agreement in which the performance obligations are terminated will result in an immediate recognition of any remaining deferred revenue and accrued liability in the period that termination occurred, provided that all performance obligations have been satisfied.

        Beginning in 2011, the Company accounts for milestones in accordance with FASB Subtopic ASC 605-28 "Revenue Recognition-Milestone Method". The Company recognizes revenue from milestone payments when (i) the milestone event is substantive and its achievability was not reasonably assured at the inception of the agreement and (ii) the Company does not have ongoing performance obligations related to the achievement of the milestone. Milestone payments are considered substantive if all of the following conditions are met: the milestone payment (a) is commensurate with either the Company's performance to achieve the milestone or the enhancement of the value of the delivered item or items as a result of a specific outcome resulting from the Company's performance to achieve the milestone, (b) relates solely to past performance, and (c) is reasonable relative to all of the deliverables and payment terms (including other potential milestone consideration) within the arrangement. See Note 3, "Collaboration Arrangements," for analysis of each milestone event deemed to be substantive or non-substantive.

        In accordance with ASC Subtopic 808-10, "Collaborative Arrangement," and pursuant to the Company's agreement with Astellas, the Company recognized as revenue the net impact of transactions with Astellas related to VIBATIV® inventories including revenue specifically attributable to any sales, and cost of inventories either transferred or expensed as unrealizable.

        The Company recognizes royalty revenue on licensee net sales in the period in which the royalties are earned.

Research and Development Costs

Research and Development Costs

        Research and development costs are expensed in the period that services are rendered or goods are received. Research and development costs consist of salaries and benefits, laboratory supplies and facility costs, as well as fees paid to third parties that conduct certain research and development activities on behalf of the Company, net of certain external research and development costs reimbursed under the Company's collaboration arrangements.

Preclinical Study and Clinical Study Expenses

Preclinical Study and Clinical Study Expenses

        A substantial portion of the Company's preclinical studies and all of its clinical studies have been performed by third-party contract research organizations (CROs). Some CROs bill monthly for services performed, while others bill based upon milestones achieved. The Company reviews the activities performed under the significant contracts each quarter. For preclinical studies, the significant factors used in estimating accruals include the percentage of work completed to date and contract milestones achieved. For clinical study expenses, the significant factors used in estimating accruals include the number of patients enrolled and percentage of work completed to date. Vendor confirmations are obtained for contracts with longer duration when necessary to validate the Company's estimate of expenses. The Company's estimates are highly dependent upon the timeliness and accuracy of the data provided by its CROs regarding the status of each program and total program spending and adjustments are made when deemed necessary.

Fair Value of Stock-Based Compensation Awards

Fair Value of Stock-Based Compensation Awards

        The Company uses the Black-Scholes-Merton option pricing model to estimate the fair value of options granted under its equity incentive plans and rights to acquire stock granted under its employee stock purchase plan (ESPP). The Black-Scholes-Merton option valuation model requires the use of assumptions, including the expected term of the award and the expected stock price volatility. The Company used the "simplified" method as described in Staff Accounting Bulletin No. 107, "Share-Based Payment", for the expected option term because the usage of its historical option exercise data is limited due to post-IPO exercise restrictions. Beginning April 1, 2011, the Company used its historical volatility to estimate expected stock price volatility. Prior to April 1, 2011, the Company used peer company price volatility to estimate expected stock price volatility due to the Company's limited historical common stock price volatility since its initial public offering in 2004.

        Restricted Stock Units (RSUs) and Restricted Stock Awards (RSAs) are measured based on the fair market values of the underlying stock on the dates of grant.

        Stock-based compensation expense was calculated based on awards ultimately expected to vest and was reduced for estimated forfeitures at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differed from those estimates. The Company's estimated annual forfeiture rates for stock options, RSUs and RSAs are based on its historical forfeiture experience.

        The estimated fair value of stock options, RSUs and RSAs is expensed on a straight-line basis over the expected term of the grant and the estimated fair value of performance-contingent RSUs and RSAs is expensed using an accelerated method over the term of the award once the Company's management has determined that it is probable that performance milestones will be achieved. Compensation expense for RSUs and RSAs that contain performance conditions is based on the grant date fair value of the award. Compensation expense is recorded over the requisite service period based on management's best estimate as to whether it is probable that the shares awarded are expected to vest. The Company's management assesses the probability of the performance milestones being met on a continuous basis.

        Compensation expense for purchases under the ESPP is recognized based on the fair value of the common stock on the date of offering, less the purchase discount percentage provided for in the plan.

        The Company has not recognized, and does not expect to recognize in the near future, any tax benefit related to employee stock-based compensation expense as a result of the full valuation allowance on the Company's deferred tax assets including deferred tax assets related to its net operating loss carryforwards.

Income Taxes

Income Taxes

        The Company utilizes the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are determined based on differences between financial reporting and tax basis of assets and liabilities and are measured using enacted tax rates and laws that will be in effect when the differences are expected to reverse. A valuation allowance is provided when it is more likely than not that some portion or all of a deferred tax asset will not be realized.

        None of the Company's currently unrecognized tax benefits would affect its effective income tax rate if recognized, due to the valuation allowance that currently offsets the Company's deferred tax assets. The Company does not anticipate the total amount of unrecognized income tax benefits relating to tax positions existing at December 31, 2012 will significantly increase or decrease in the next 12 months.

        The Company's management assesses all material positions taken in any income tax return, including all significant uncertain positions, in all tax years that are still subject to assessment or challenge by relevant taxing authorities. Assessing an uncertain tax position begins with the initial determination of the position's sustainability and is measured at the largest amount of benefit that is greater than 50% likely to be realized upon ultimate settlement. As of each balance sheet date, unresolved uncertain tax positions must be reassessed, and the Company's management will determine whether: the factors underlying the sustainability assertion have changed; and the amount of the recognized tax benefit is still appropriate.

        The recognition and measurement of tax benefits requires significant judgment. Judgments concerning the recognition and measurement of a tax benefit might change as new information becomes available.

Foreign Currency

Foreign Currency

        The Company uses the U.S. dollar as the functional currency for its foreign subsidiary. Monetary and non-monetary assets and liabilities are remeasured into U.S. dollars at the applicable period end exchange rate. Operating expenses are remeasured at average exchange rates in effect during each period, except for those expenses related to non-monetary assets which are remeasured at historical exchange rates. Gains or losses from remeasurement of foreign currency financial statements into U.S. dollars are included in the condensed consolidated statements of operations and were insignificant for all periods presented, as was the effect of exchange rate changes on cash and cash equivalents.

Comprehensive Loss

Comprehensive Loss

        Comprehensive loss is comprised of net loss and other comprehensive income (loss). Other comprehensive income (loss) consists of changes in unrealized gains and losses on the Company's available-for-sale securities, net of tax.

Related Parties

Related Parties

        Transactions with GSK are described in Note 3, "Collaboration Arrangements".

        Robert V. Gunderson, Jr. is a director of the Company. The Company has engaged Gunderson Dettmer Stough Villeneuve Franklin & Hachigian, LLP, of which Mr. Gunderson is a partner, as its primary legal counsel. Fees incurred in the ordinary course of business were $1.2 million in 2012, $0.3 million in 2011, and $0.7 million in 2010.