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Cash, Cash Equivalents, Restricted Cash and Marketable Securities - Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | $ 232,652 | $ 165,005
Unrealized Gains | 42 | 48
Unrealized Losses | (20) | (17)
Estimated Fair Value | 232,674 | 165,036
Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 79,055 | 32,073
Estimated Fair Value | 79,055 | 32,073
Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 153,597 | 132,932
Unrealized Gains | 42 | 48
Unrealized Losses | (20) | (17)
Estimated Fair Value | 153,619 | 132,963
Cash | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 7,681 | 7,945
Estimated Fair Value | 7,681 | 7,945
Money Market Funds | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 71,374 | 23,128
Estimated Fair Value | 71,374 | 23,128
U.S. Treasuries | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 28,448 | 32,548
Unrealized Gains | 17 | 31
Estimated Fair Value | 28,465 | 32,579
U.S. Government Agency Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 47,462 | 40,313
Unrealized Gains | 17 | 14
Unrealized Losses | (7) | (6)
Estimated Fair Value | 47,472 | 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 | 77,687 | 60,071
Unrealized Gains | 8 | 3
Unrealized Losses | (13) | (11)
Estimated Fair Value | $ 77,682 | $ 60,063

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