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Cash, Cash Equivalents, Restricted Cash and Marketable Securities - Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | $ 165,005 | $ 150,983
Unrealized Gains | 48 | 84
Unrealized Losses | (17) | (12)
Estimated Fair Value | 165,036 | 151,055
Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 32,073 | 39,884
Estimated Fair Value | 32,073 | 39,884
Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 132,932 | 111,099
Unrealized Gains | 48 | 84
Unrealized Losses | (17) | (12)
Estimated Fair Value | 132,963 | 111,171
Cash | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 7,945 | 4,038
Estimated Fair Value | 7,945 | 4,038
Money Market Funds | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 23,128 | 27,854
Estimated Fair Value | 23,128 | 27,854
Corporate Debt Securities | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 1,000 | 7,992
Estimated Fair Value | 1,000 | 7,992
Corporate Debt Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 60,071 | 53,353
Unrealized Gains | 3 | 28
Unrealized Losses | (11) |
Estimated Fair Value | 60,063 | 53,381
U.S. Treasuries | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 32,548 | 6,511
Unrealized Gains | 31 | 6
Estimated Fair Value | 32,579 | 6,517
U.S. Government Agency Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 40,313 | 51,235
Unrealized Gains | 14 | 50
Unrealized Losses | (6) | (12)
Estimated Fair Value | $ 40,321 | $ 51,273

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