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Fair Value Measurements | 3 Months Ended
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Mar. 31, 2021
Fair Value Disclosures [Abstract] |
Fair Value Measurements | 3. Fair Value Measurements The following tables present information about the Company’s financial assets measured at fair value on a recurring basis and indicate the fair value hierarchy classification of such fair values as of March 31, 2021 and December 31, 2020 (in thousands):
|  | Fair Value Measurements at |
|  | March 31, 2021 |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 494,170 |  |  | $ | 494,170 |  |  | $ | — |  |  | $ | — |
Money market funds |  |  | 629,357 |  |  |  | 629,357 |  |  |  | — |  |  |  | — |
Corporate debt securities |  |  | 2,532 |  |  |  | — |  |  |  | 2,532 |  |  |  | — |
Certificates of deposit |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Commercial paper |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Corporate debt securities |  |  | 535,630 |  |  |  | — |  |  |  | 535,630 |  |  |  | — |
Certificates of deposit |  |  | 54,273 |  |  |  | — |  |  |  | 54,273 |  |  |  | — |
Government-sponsored enterprise securities |  |  | 3,119 |  |  |  | — |  |  |  | 3,119 |  |  |  | — |
Commercial paper |  |  | 87,122 |  |  |  | — |  |  |  | 87,122 |  |  |  | — |
Other non-current assets |  |  | 2,212 |  |  |  | — |  |  |  | — |  |  |  | 2,212 |
Total |  | $ | 1,808,415 |  |  | $ | 1,123,527 |  |  | $ | 682,676 |  |  | $ | 2,212 |
|  | Fair Value Measurements at |
|  | December 31, 2020 |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 395,083 |  |  | $ | 395,083 |  |  | $ | — |  |  | $ | — |
Money market funds |  |  | 742,958 |  |  |  | 742,958 |  |  |  | — |  |  |  | — |
Corporate debt securities |  |  | 2,503 |  |  |  | — |  |  |  | 2,503 |  |  |  | — |
Certificates of deposit |  |  | 12,527 |  |  |  | — |  |  |  | 12,527 |  |  |  | — |
Commercial paper |  |  | 15,549 |  |  |  | — |  |  |  | 15,549 |  |  |  | — |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | 47,979 |  |  |  | — |  |  |  | 47,979 |  |  |  | — |
Corporate debt securities |  |  | 324,456 |  |  |  | — |  |  |  | 324,456 |  |  |  | — |
Certificates of deposit |  |  | 25,162 |  |  |  | — |  |  |  | 25,162 |  |  |  | — |
Government-sponsored enterprise securities |  |  | 33,741 |  |  |  | — |  |  |  | 33,741 |  |  |  | — |
Commercial paper |  |  | 90,375 |  |  |  | — |  |  |  | 90,375 |  |  |  | — |
Other non-current assets |  |  | 600 |  |  |  | — |  |  |  | — |  |  |  | 600 |
Total |  | $ | 1,690,933 |  |  | $ | 1,138,041 |  |  | $ | 552,292 |  |  | $ | 600 |
Marketable securities classified as Level 2 within the valuation hierarchy generally consist of U.S. treasury securities and government agency securities, corporate bonds, and commercial paper. The Company estimates the fair values of these marketable securities by taking into consideration valuations obtained from third-party pricing sources. The Company holds equity securities classified as Level 3 which are not material to the Company’s financial position.

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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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