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Cash, Cash Equivalents, Restricted Cash and Marketable Securities - Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | $ 345,744 | $ 165,005
Unrealized Gains | 60 | 48
Unrealized Losses |  | (17)
Estimated Fair Value | 345,804 | 165,036
Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 129,608 | 32,073
Estimated Fair Value | 129,608 | 32,073
Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 216,136 | 132,932
Unrealized Gains | 60 | 48
Unrealized Losses |  | (17)
Estimated Fair Value | 216,196 | 132,963
Cash | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 17,008 | 7,945
Estimated Fair Value | 17,008 | 7,945
Money Market Funds | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 112,600 | 23,128
Estimated Fair Value | 112,600 | 23,128
U.S. Treasuries | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 23,347 | 32,548
Unrealized Gains | 5 | 31
Estimated Fair Value | 23,352 | 32,579
U.S. Government Agency Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 41,715 | 40,313
Unrealized Gains | 10 | 14
Unrealized Losses |  | (6)
Estimated Fair Value | 41,725 | 40,321
Corporate Debt Securities | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost |  | 1,000
Estimated Fair Value |  | 1,000
Corporate Debt Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 151,074 | 60,071
Unrealized Gains | 45 | 3
Unrealized Losses |  | (11)
Estimated Fair Value | $ 151,119 | $ 60,063

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