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Fair Value Measurements | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Fair Value Measurements |
3. | Fair Value Measurements
The following tables summarize the Company’s financial assets measured at fair value on a recurring basis by level within the fair value hierarchy:
|  | December 31, 2020 |
|  | Fair Value Hierarchy |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Market Value |
|  | (In thousands) |
Money market funds |  | Level 1 |  | $ | 37,951 |  |  | $ | — |  |  | $ | — |  |  | $ | 37,951 |
U.S. government treasury securities |  | Level 1 |  |  | 357,725 |  |  |  | 620 |  |  |  | (6 | ) |  |  | 358,339 |
Corporate bonds |  | Level 2 |  |  | 5,000 |  |  |  | — |  |  |  | — |  |  |  | 5,000 |
Total cash equivalents and marketable securities |  |  |  | $ | 400,676 |  |  | $ | 620 |  |  | $ | (6 | ) |  | $ | 401,290 |
|  | December 31, 2019 |
|  | Fair Value Hierarchy |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Market Value |
|  | (In thousands) |
Money market funds |  | Level 1 |  | $ | 61,104 |  |  | $ | — |  |  | $ | — |  |  | $ | 61,104 |
U.S. government treasury securities |  | Level 1 |  |  | 227,446 |  |  |  | 149 |  |  |  | (8 | ) |  |  | 227,587 |
Commercial paper |  | Level 2 |  |  | 43,735 |  |  |  | — |  |  |  | — |  |  |  | 43,735 |
Corporate bonds |  | Level 2 |  |  | 10,103 |  |  |  | 3 |  |  |  | (2 | ) |  |  | 10,104 |
Total cash equivalents and marketable securities |  |  |  | $ | 342,388 |  |  | $ | 152 |  |  | $ | (10 | ) |  | $ | 342,530 |
The Company’s Level 2 securities are valued using third-party pricing sources. The pricing services utilize industry standard valuation models for which all significant inputs are observable. There were no transfers between levels of the fair value hierarchy during the year ended December 31, 2020. The Company classifies marketable securities available to fund current operations as current assets. As of December 31, 2020, the remaining contractual maturities of $336.9 million investments were less than one year and $64.4 million investments were after one year through two years. The Company does not intend to sell the investments that are in an unrealized loss position before recovery of their amortized cost basis, which may be maturity.

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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