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Investments - Summary of Gross Unrealized Losses and Fair Value of Available-For-Sale Investment Securities in Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Estimated Fair Value | $ 210,202 | $ 230,174
Less Than 12 Months, Unrealized Losses | (357) | (1,037)
Total, Estimated Fair Value | 210,202 | 230,174
Total, Unrealized Losses | (357) | (1,037)
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Estimated Fair Value | 42,090 | 15,945
Less Than 12 Months, Unrealized Losses | (90) | (11)
Total, Estimated Fair Value | 42,090 | 15,945
Total, Unrealized Losses | (90) | (11)
US Government Sponsored Enterprises Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Estimated Fair Value | 168,112 | 58,254
Less Than 12 Months, Unrealized Losses | (267) | (291)
Total, Estimated Fair Value | 168,112 | 58,254
Total, Unrealized Losses | $ (267) | (291)
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Estimated Fair Value |  | 20,775
Less Than 12 Months, Unrealized Losses |  | (98)
Total, Estimated Fair Value |  | 20,775
Total, Unrealized Losses |  | (98)
Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Estimated Fair Value |  | 135,200
Less Than 12 Months, Unrealized Losses |  | (637)
Total, Estimated Fair Value |  | 135,200
Total, Unrealized Losses |  | $ (637)

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