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Investments, Available-for-Sale (Tables) | 9 Months Ended
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Sep. 30, 2021
Investments Debt And Equity Securities [Abstract] |
Schedule of Cost, Gross Unrealized Holding Gains, Gross Unrealized Holding Losses and Fair Value of Available for Sale Investments | The Company's available-for-sale investments consisted of the following (in thousands):
September 30, 2021 |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
U.S. treasury securities |  | $ | 47,656 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 47,657 |
Certificates of deposit |  |  | 736 |  |  |  | — |  |  |  | — |  |  |  | 736 |
Short-term investments, available-for-sale |  | $ | 48,392 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 48,393 |
U.S. treasury securities |  | $ | 6,006 |  |  | $ | — |  |  | $ | (3 | ) |  | $ | 6,003 |
Certificates of deposit |  |  | 953 |  |  |  | — |  |  |  | — |  |  |  | 953 |
Investments, available-for-sale |  | $ | 6,959 |  |  | $ | — |  |  | $ | (3 | ) |  | $ | 6,956 |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 215,185 |  |  | $ | — |  |  | $ | (31 | ) |  | $ | 215,154 |
Short-term investments, available-for-sale |  | $ | 215,185 |  |  | $ | — |  |  | $ | (31 | ) |  | $ | 215,154 |

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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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