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Fair Value Measurements | 9 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Fair Value Measurements | 7. Fair Value Measurements The Company measures and reports certain financial instruments as assets and liabilities at fair value on a recurring basis. The following tables sets forth the fair value of the Company’s financial assets and liabilities at fair value on a recurring basis based on the three-tier fair value hierarchy (in thousands):
|  | September 30, 2018 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 6,550 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,550 |
Reverse repurchase agreements |  |  | — |  |  |  | 6,250 |  |  |  | — |  |  |  | 6,250 |
Commercial paper |  |  | — |  |  |  | 32,230 |  |  |  | — |  |  |  | 32,230 |
U.S. government securities |  |  | — |  |  |  | 17,973 |  |  |  | — |  |  |  | 17,973 |
Total financial assets |  | $ | 6,550 |  |  | $ | 56,453 |  |  | $ | — |  |  | $ | 63,003 |
|  | December 31, 2017 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 1,674 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,674 |
Reverse repurchase agreements |  |  | — |  |  |  | 7,250 |  |  |  | — |  |  |  | 7,250 |
U.S. treasury securities |  |  | 1,501 |  |  |  | — |  |  |  | — |  |  |  | 1,501 |
U.S. government securities |  |  | — |  |  |  | 35,981 |  |  |  | — |  |  |  | 35,981 |
Total financial assets |  | $ | 3,175 |  |  | $ | 43,231 |  |  | $ | — |  |  | $ | 46,406 |
The Company measures the fair value of money market funds on quoted prices in active markets for identical asset or liabilities. The Level 2 assets include reverse repurchase agreements and U.S. government securities and are valued based on quoted prices for similar assets in active markets and inputs other than quoted prices that are derived from observable market data. The Company evaluates transfers between levels at the end of each reporting period. There were no transfers between Level 1 and Level 2 during the periods presented.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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