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Fair Value Measurements | 9 Months Ended
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Sep. 30, 2017
Fair Value Disclosures [Abstract] |
Fair Value Measurements | 4. Fair Value Measurements The Company discloses and recognizes the fair value of its assets and liabilities using a hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the reporting date. The hierarchy gives the highest priority to valuations based upon unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to valuations based upon unobservable inputs that are significant to the valuation (Level 3 measurements). The guidance establishes three levels of the fair value hierarchy as follows: Level 1 - Inputs are unadjusted quoted prices in active markets for identical assets or liabilities at the measurement date. Level 2 - Inputs (other than quoted market prices included in Level 1) are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life. Level 3 - Inputs reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model. Assets and liabilities measured at fair value are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires management to make judgments and consider factors specific to the asset or liability. The corporate notes, commercial paper and government bonds are classified as Level 2 as they were valued based upon quoted market prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model-based valuation techniques for which all significant inputs are observable in the market or can be corroborated by observable market data for substantially the full term of the assets. Based on Level 2 inputs and the borrowing rates currently available to the Company for loans with similar terms and maturities, the carrying value of the Company’s debt approximates its fair value. The following table presents the fair value of the Company’s financial assets and liabilities determined using the inputs defined above (amounts in thousands).
|  | September 30, 2017 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 5,722 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,722 |
U.S. government securities |  |  | — |  |  |  | 35,917 |  |  |  | — |  |  |  | 35,917 |
Corporate notes |  |  | — |  |  |  | 15,666 |  |  |  | — |  |  |  | 15,666 |
Commercial paper |  |  | — |  |  |  | 48,130 |  |  |  | — |  |  |  | 48,130 |
Total |  | $ | 5,722 |  |  | $ | 99,713 |  |  | $ | — |  |  | $ | 105,435 |
|  | December 31, 2016 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 45,937 |  |  | $ | — |  |  | $ | — |  |  | $ | 45,937 |
U.S. government securities |  |  | — |  |  |  | 16,490 |  |  |  | — |  |  |  | 16,490 |
Corporate notes |  |  | — |  |  |  | 23,927 |  |  |  | — |  |  |  | 23,927 |
Commercial paper |  |  | — |  |  |  | 24,971 |  |  |  | — |  |  |  | 24,971 |
Total |  | $ | 45,937 |  |  | $ | 65,388 |  |  | $ | — |  |  | $ | 111,325 |
The following table sets forth a summary of the changes in the fair value of the preferred stock warrants which is classified as Level 3 in the fair value hierarchy. There were no transfers into or out of Level 3 during the periods (in thousands):
|  | Nine Months Ended September 30, 2017 |  |  | Nine Months Ended September 30, 2016 |
Beginning balance |  | $ | — |  |  | $ | 2,949 |
Total change in fair value recorded as other expense, net |  |  | — |  |  |  | 996 |
Ending balance |  | $ | — |  |  | $ | 3,945 |
The valuation of the preferred stock warrant liabilities is discussed in Note 11.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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