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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2020
Fair Value Disclosures [Abstract] |
Financial Assets And Liabilities Subject To Fair Value Measurements On Recurring Basis And Level Of Inputs Used In Such Measurements By Major Security Type | Financial assets and liabilities subject to fair value measurements on a recurring basis and the level of inputs used in such measurements by major security type as of March 31, 2020 and as of December 31, 2019 are presented in the following tables:
| March 31, 2020 |  |  |  |  |  |
| Level 1 |  | Level 2 |  | Level 3 |  | Fair Value
| (in thousands) |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |  |
Money market funds (1) | $ | 113,143 |  |  | $ | — |  |  | $ | — |  |  | $ | 113,143 |
Commercial paper | — |  |  | 25,786 |  |  | — |  |  | 25,786 |
Corporate bonds | — |  |  | 190,854 |  |  | — |  |  | 190,854 |
U.S. treasury securities | 180,313 |  |  | — |  |  | — |  |  | 180,313 |
U.S. agency securities | — |  |  | 29,192 |  |  | — |  |  | 29,192 |
Total financial assets | $ | 293,456 |  |  | $ | 245,832 |  |  | $ | — |  |  | $ | 539,288 |
| December 31, 2019 |  |  |  |  |  |
| Level 1 |  | Level 2 |  | Level 3 |  | Fair Value
| (in thousands) |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |  |
Money market funds (1) | $ | 122,900 |  |  | $ | — |  |  | $ | — |  |  | $ | 122,900 |
Corporate bonds | — |  |  | 205,011 |  |  | — |  |  | 205,011 |
U.S. treasury securities | 181,894 |  |  | — |  |  | — |  |  | 181,894 |
U.S. agency securities | — |  |  | 25,824 |  |  | — |  |  | 25,824 |
Certificates of deposit | — |  |  | 1,000 |  |  | — |  |  | 1,000 |
Total financial assets | $ | 304,794 |  |  | $ | 231,835 |  |  | $ | — |  |  | $ | 536,629 |
(1)Included within cash and cash equivalents on the Company’s balance sheets

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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