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Investments (Tables) | 6 Months Ended
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Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Investments | Available-for-sale investments consisted of the following as of June 30, 2023 and December 31, 2022 (in thousands):
|  | June 30, 2023 |
|  | Amortized Cost |  |  | Unrealized Gain |  |  | Unrealized Loss |  |  | Estimated Fair Value |
Short-term marketable securities |  |  |  |  |  |  |  |  |  |  |  |
U.S. government treasury and agency securities |  | $ | 308,885 |  |  | $ | 12 |  |  | $ | (907 | ) |  | $ | 307,990 |
Total short-term marketable securities |  | $ | 308,885 |  |  | $ | 12 |  |  | $ | (907 | ) |  | $ | 307,990 |
|  | December 31, 2022 |
|  | Amortized Cost |  |  | Unrealized Gain |  |  | Unrealized Loss |  |  | Estimated Fair Value |
Short-term marketable securities |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 9,969 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,969 |
U.S. government treasury securities |  |  | 389,898 |  |  |  | 14 |  |  |  | (4,064 | ) |  |  | 385,848 |
Corporate bonds |  |  | 12,415 |  |  |  | — |  |  |  | (66 | ) |  |  | 12,349 |
Total short-term marketable securities |  | $ | 412,282 |  |  | $ | 14 |  |  | $ | (4,130 | ) |  | $ | 408,166 |
Schedule of Gross Unrealized Holding Losses and Fair Value for Investments in Unrealized Loss Position | The following table presents the gross unrealized holding losses and fair values for investments in an unrealized loss position, and the length of time individual securities have been in a continuous loss position, as of June 30, 2023 (in thousands):
|  | Less Than 12 Months |  |  | 12 Months Or Greater |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
U.S. government treasury and agency securities |  | $ | 199,578 |  |  | $ | (250 | ) |  | $ | 67,989 |  |  | $ | (657 | )
Total available-for-sale securities |  | $ | 199,578 |  |  | $ | (250 | ) |  | $ | 67,989 |  |  | $ | (657 | )

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- Definition Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-6 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-4 + Details
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