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Investments (Tables) | 9 Months Ended
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Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract] |
Carrying Value and Amortized Cost of Company Investments Summarized by Major Security Type | The carrying value and amortized cost of the Company’s investments, summarized by major security type, consisted of the following (in thousands):
|  | September 30, 2023 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
U.S. Treasury notes |  | $ | 42,180 |  |  | $ | — |  |  | $ | (90 | ) |  | $ | 42,090 |
Government sponsored enterprise securities |  |  | 205,876 |  |  |  | 28 |  |  |  | (267 | ) |  |  | 205,637 |
|  | $ | 248,056 |  |  | $ | 28 |  |  | $ | (357 | ) |  | $ | 247,727 |
|  | December 31, 2022 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
U.S. Treasury notes |  | $ | 15,956 |  |  | $ | — |  |  | $ | (11 | ) |  | $ | 15,945 |
Government sponsored enterprise securities |  |  | 81,216 |  |  |  | 16 |  |  |  | (291 | ) |  |  | 80,941 |
Corporate debt securities |  |  | 20,873 |  |  |  | — |  |  |  | (98 | ) |  |  | 20,775 |
Commercial paper |  |  | 184,923 |  |  |  | 30 |  |  |  | (637 | ) |  |  | 184,316 |
|  | $ | 302,968 |  |  | $ | 46 |  |  | $ | (1,037 | ) |  | $ | 301,977 |
Summary of Gross Unrealized Losses and Fair Value of Available-For-Sale Investment Securities in Unrealized Loss Position | The following table presents gross unrealized losses and fair value for those available-for-sale investment securities that were in an unrealized loss position as of September 30, 2023 and December 31, 2022, aggregated by investment category and length of time that the individual securities have been in a continuous loss position (in thousands):
|  | Less Than 12 Months |  |  | 12 Months or Greater |  |  | Total |  |
|  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |  |
September 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury notes |  | $ | 42,090 |  |  | $ | (90 | ) |  | $ | — |  |  | $ | — |  |  | $ | 42,090 |  |  | $ | (90 | ) |
Government sponsored enterprise securities |  |  | 168,112 |  |  |  | (267 | ) |  |  | — |  |  |  | — |  |  |  | 168,112 |  |  |  | (267 | ) |
Total |  | $ | 210,202 |  |  | $ | (357 | ) |  | $ | — |  |  | $ | — |  |  | $ | 210,202 |  |  | $ | (357 | ) |
|  | Less Than 12 Months |  |  | 12 Months or Greater |  |  | Total |  |
|  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |  |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury notes |  | $ | 15,945 |  |  | $ | (11 | ) |  | $ | — |  |  | $ | — |  |  | $ | 15,945 |  |  | $ | (11 | ) |
Government sponsored enterprise securities |  |  | 58,254 |  |  |  | (291 | ) |  |  | — |  |  |  | — |  |  |  | 58,254 |  |  |  | (291 | ) |
Corporate debt securities |  |  | 20,775 |  |  |  | (98 | ) |  |  | — |  |  |  | — |  |  |  | 20,775 |  |  |  | (98 | ) |
Commercial paper |  |  | 135,200 |  |  |  | (637 | ) |  |  | — |  |  |  | — |  |  |  | 135,200 |  |  |  | (637 | ) |
Total |  | $ | 230,174 |  |  | $ | (1,037 | ) |  | $ | — |  |  | $ | — |  |  | $ | 230,174 |  |  | $ | (1,037 | ) |

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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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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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