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Fair Value Measurements and Fair Value of Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2021
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets Measured on Recurring Basis | The following tables set forth the fair value of the Company’s financial assets that were measured at fair value on a recurring basis by level within the fair value hierarchy (in thousands).
|  | September 30, 2021
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: | Classification: |  |  |  |  |  |  |
Money market funds | Cash and cash equivalents | $ | 330,308 |  |  | $ | — |  |  | $ | — |  |  | $ | 330,308 |
U.S. Treasury securities | Investments | — |  |  | 175,202 |  |  | — |  |  | 175,202 |
Total assets measured at fair value |  | $ | 330,308 |  |  | $ | 175,202 |  |  | $ | — |  |  | $ | 505,510 |
|  | December 31, 2020
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: | Classification: |  |  |  |  |  |  |
Money market funds | Cash and cash equivalents | $ | 333,585 |  |  | $ | — |  |  | $ | — |  |  | $ | 333,585 |
U.S. Treasury securities | Investments | — |  |  | 98,278 |  |  | — |  |  | 98,278 |
Total assets measured at fair value |  | $ | 333,585 |  |  | $ | 98,278 |  |  | $ | — |  |  | $ | 431,863 |
Schedule of Debt Securities, Available-for-sale, Unrealized Gain | The following is a summary of the Company’s cash equivalents and investments and the gross unrealized holding gains and losses (in thousands):
| September 30, 2021
| Amortized Cost Basis |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Assets: |  |  |  |  |  |  |
Money market funds | $ | 330,308 |  |  | $ | — |  |  | $ | — |  |  | $ | 330,308 |
U.S. Treasury securities | 175,210 |  |  | 12 |  |  | (20) |  |  | 175,202 |
Total | $ | 505,518 |  |  | $ | 12 |  |  | $ | (20) |  |  | $ | 505,510 |
| December 31, 2020
| Amortized Cost Basis |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Assets: |  |  |  |  |  |  |
Money market funds | $ | 333,585 |  |  | $ | — |  |  | $ | — |  |  | $ | 333,585 |
U.S. Treasury securities | 98,223 |  |  | 57 |  |  | (2) |  |  | 98,278 |
Total | $ | 431,808 |  |  | $ | 57 |  |  | $ | (2) |  |  | $ | 431,863 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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