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Cash, Cash Equivalents, Restricted Cash and Marketable Securities - Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | $ 177,080 | $ 150,983
Unrealized Gains | 84 | 84
Unrealized Losses | (3) | (12)
Estimated Fair Value | 177,161 | 151,055
Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 32,688 | 39,884
Estimated Fair Value | 32,688 | 39,884
Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 144,392 | 111,099
Unrealized Gains | 84 | 84
Unrealized Losses | (3) | (12)
Estimated Fair Value | 144,473 | 111,171
Cash | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 2,998 | 4,038
Estimated Fair Value | 2,998 | 4,038
Money Market Funds | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 25,138 | 27,854
Estimated Fair Value | 25,138 | 27,854
Corporate Debt Securities | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 4,552 | 7,992
Estimated Fair Value | 4,552 | 7,992
Corporate Debt Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 65,362 | 53,353
Unrealized Gains | 22 | 28
Unrealized Losses | (1) |
Estimated Fair Value | 65,383 | 53,381
U.S. Treasuries | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 30,622 | 6,511
Unrealized Gains | 51 | 6
Estimated Fair Value | 30,673 | 6,517
U.S. Government Agency Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 48,408 | 51,235
Unrealized Gains | 11 | 50
Unrealized Losses | (2) | (12)
Estimated Fair Value | $ 48,417 | $ 51,273

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