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Investments (Tables) | 12 Months Ended
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Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Investments | Available-for-sale investments consisted of the following as of December 31, 2022 and 2021 (in thousands):
|  | 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 debt 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 |
|  | December 31, 2021 |
|  | Amortized Cost |  |  | Unrealized Gain |  |  | Unrealized Loss |  |  | Estimated Fair Value |
Short-term marketable securities |  |  |  |  |  |  |  |  |  |  |  |
U.S. government debt securities |  | $ | 186,752 |  |  | $ | 4 |  |  | $ | (109 | ) |  | $ | 186,647 |
Corporate bonds |  |  | 27,363 |  |  |  | — |  |  |  | (14 | ) |  |  | 27,349 |
Total short-term marketable securities |  | $ | 214,115 |  |  | $ | 4 |  |  | $ | (123 | ) |  | $ | 213,996 |
Long-term marketable securities |  |  |  |  |  |  |  |  |  |  |  |
U.S. government debt securities |  | $ | 205,472 |  |  | $ | — |  |  | $ | (974 | ) |  | $ | 204,498 |
Corporate bonds |  |  | 12,691 |  |  |  | — |  |  |  | (44 | ) |  |  | 12,647 |
Total long-term marketable securities |  | $ | 218,163 |  |  | $ | — |  |  | $ | (1,018 | ) |  | $ | 217,145 |
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 value for investments in an unrealized loss position, and the length of time individual securities have been in a continuous loss position, as of December 31, 2022 (in thousands):
|  | Less Than 12 Months |  |  | 12 Months Or Greater |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
U.S. government debt securities |  | $ | 130,541 |  |  | $ | (346 | ) |  | $ | 201,153 |  |  | $ | (3,718 | )
Corporate bonds |  |  | — |  |  |  | — |  |  |  | 12,349 |  |  |  | (66 | )
Total available-for-sale securities |  | $ | 130,541 |  |  | $ | (346 | ) |  | $ | 213,502 |  |  | $ | (3,784 | )

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
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