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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 | Dec. 31, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Estimated Fair Value | $ 290,997 | $ 169,353
Less Than 12 Months, Unrealized Losses | 213 | 43
Total, Estimated Fair Value | 290,997 | 169,353
Total, Unrealized Losses | 213 | 43
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Estimated Fair Value | 140,287 | 129,631
Less Than 12 Months, Unrealized Losses | 100 | 27
Total, Estimated Fair Value | 140,287 | 129,631
Total, Unrealized Losses | 100 | 27
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Estimated Fair Value |  | 6,252
Total, Estimated Fair Value |  | 6,252
Total, Unrealized Losses |  |
Municipal Bonds |  |
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 |
US Government Sponsored Enterprises Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Estimated Fair Value | 49,512 | 10,004
Less Than 12 Months, Unrealized Losses | 38 | 5
Total, Estimated Fair Value | 49,512 | 10,004
Total, Unrealized Losses | 38 | 5
Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Estimated Fair Value | 75,192 | 23,466
Less Than 12 Months, Unrealized Losses | 53 | 11
Total, Estimated Fair Value | 75,192 | 23,466
Total, Unrealized Losses | $ 53 | $ 11

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