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Fair Value Measurement | 12 Months Ended
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Dec. 31, 2013
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Fair Value Measurement | NOTE 2 –FAIR VALUE MEASUREMENT The Company measures certain assets and liabilities at fair value on a recurring basis, including cash equivalents, available-for-sale securities and contingent consideration liability. The fair value is determined based on a three-tier hierarchy under the authoritative guidance for fair value measurements and disclosures that prioritizes the inputs used in measuring fair value as follows: Level 1: Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2: Quoted prices in markets that are not active, or inputs which are observable, either directly or indirectly, for substantially the full term of the asset or liability; Level 3: Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity). When observable market prices for identical securities that are traded in less active markets are used, the Company classifies its available-for-sale debt instruments as Level 2. When observable market prices for identical securities are not available, available-for-sale debt instruments are priced using benchmark curves, benchmarking of like securities, sector groupings, and matrix pricing as well as model processes. These models are proprietary valuation models of pricing providers or brokers. These valuation models incorporate a number of inputs, including, listed in approximate order of priority: benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data including market research publications. For certain security types, additional inputs may be used, or some of the Standard Inputs may not be applicable. Evaluators may prioritize inputs differently on any given day for any security based on market conditions, and not all inputs listed are available for use in the evaluation process for each security evaluation on any given day. The fair value measurements of cash equivalents, available-for-sale securities and contingent consideration liabilities are identified at the following levels within the fair value hierarchy (in thousands):
|  | December 31, 2013 Fair Value Measurements |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 6,934 |  |  | $ | 6,934 |  |  | $ | — |  |  | $ | — |
U.S. government sponsored entity debt securities |  |  | 121,290 |  |  |  | — |  |  |  | 121,290 |  |  |  | — |
Total |  | $ | 128,224 |  |  | $ | 6,934 |  |  | $ | 121,290 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration liability |  | $ | 1,570 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,570 |
Total |  | $ | 1,570 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,570 |
|  | December 31, 2012 Fair Value Measurements |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 15,839 |  |  |  | 15,839 |  |  |  | — |  |  |  | — |
U.S. government sponsored entity debt securities |  |  | 57,449 |  |  |  | — |  |  |  | 57,449 |  |  |  | — |
Total |  | $ | 73,288 |  |  | $ | 15,839 |  |  | $ | 57,449 |  |  | $ | — |
Contingent Consideration Liability The Company initially recorded a liability on the acquisition date of the estimated fair value of contingent consideration payments to former Ceregene stockholders, as outlined under the terms of the merger agreement with Ceregene. These contingent payments are owed if the Company grants a third-party license to develop and commercialize certain product candidates acquired from Ceregene, or if the Company commercializes any of these product candidates itself. The fair values of these Level 3 liabilities are estimated using a probability-weighted discounted cash flow analysis. Such valuations require significant estimates and assumptions including but not limited to: determining the timing and estimated costs to complete the in-process projects, projecting regulatory approvals, estimating future cash flows, and developing appropriate discount rates. Subsequent changes in the fair value of these contingent consideration liabilities are recorded to the “Change in fair value of contingent liability” expense line item in the Consolidated Statements of Operations under operating expenses. From the acquisition date of October 1, 2013 through December 31, 2013, the recognized amount of the liability for contingent consideration increased by $0.1 million primarily as the result of the passage of time.
|  | Year ended December 31, 2013 |
Fair value on date of acquisition (October 1, 2013) |  | $ | 1,510 |
Change in fair value |  |  | 60 |
Fair value at end of period |  | $ | 1,570 |

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