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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Available-for-sale Marketable Securities | The following tables summarize the Company's marketable debt securities (in thousands):
| September 30, 2021 |  |  |  |  |  |  |  |  |  |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities | $ | 68,019 |  |  | $ | 2 |  |  | $ | (4) |  |  | $ | 68,017 |  |  |  |  |  |  |  |  |  |  |
Government-sponsored enterprises | 12,278 |  |  | 1 |  |  | — |  |  | 12,279 |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities | 28,074 |  |  | — |  |  | (3) |  |  | 28,071 |  |  |  |  |  |  |  |  |  |  |
Total | $ | 108,371 |  |  | $ | 3 |  |  | $ | (7) |  |  | $ | 108,367 |  |  |  |  |  |  |  |  |  |  |
| December 31, 2020
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury securities | $ | 60,630 |  |  | $ | 1 |  |  | $ | (7) |  |  | $ | 60,624 |
Corporate debt securities | 30,777 |  |  | 2 |  |  | (3) |  |  | 30,776 |
Total | $ | 91,407 |  |  | $ | 3 |  |  | $ | (10) |  |  | $ | 91,400 |

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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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