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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 | Mar. 31, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Estimated Fair Value | $ 238,683 | $ 290,997
Less Than 12 Months, Unrealized Losses | (626) | (213)
Total, Estimated Fair Value | 238,683 | 290,997
Total, Unrealized Losses | (626) | (213)
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Estimated Fair Value | 97,873 | 140,287
Less Than 12 Months, Unrealized Losses | (211) | (100)
Total, Estimated Fair Value | 97,873 | 140,287
Total, Unrealized Losses | (211) | (100)
US Government Sponsored Enterprises Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Estimated Fair Value | 49,507 | 49,512
Less Than 12 Months, Unrealized Losses | (141) | (38)
Total, Estimated Fair Value | 49,507 | 49,512
Total, Unrealized Losses | (141) | (38)
Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Estimated Fair Value | 70,216 | 75,192
Less Than 12 Months, Unrealized Losses | (243) | (53)
Total, Estimated Fair Value | 70,216 | 75,192
Total, Unrealized Losses | (243) | (53)
Municipal bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Estimated Fair Value | 21,087 |
Less Than 12 Months, Unrealized Losses | (31) |
Total, Estimated Fair Value | 21,087 |
Total, Unrealized Losses | $ (31) |
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Estimated Fair Value |  | 26,006
Less Than 12 Months, Unrealized Losses |  | (22)
Total, Estimated Fair Value |  | 26,006
Total, Unrealized Losses |  | $ (22)

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