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Fair Value of Financial Instruments - Summary of Composition of Short and Long Term Investments (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 1,286,649 | $ 1,204,247
Unrealized Gains | 428 | 24
Unrealized Losses | (5,716) | (9,818)
Aggregate Fair Value | 1,281,361 | 1,194,453
Commercial Paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 20,325 | 16,036
Aggregate Fair Value | 20,325 | 16,036
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 250,920 | 265,875
Unrealized Gains | 96 | 9
Unrealized Losses | (2,523) | (3,966)
Aggregate Fair Value | 248,493 | 261,918
U.S. Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 55,791 | 40,908
Unrealized Gains | 13 | 1
Unrealized Losses | (629) | (944)
Aggregate Fair Value | 55,175 | 39,965
US Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 959,613 | 881,428
Unrealized Gains | 319 | 14
Unrealized Losses | (2,564) | (4,908)
Aggregate Fair Value | $ 957,368 | $ 876,534

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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