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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, 2019 | Dec. 31, 2018
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Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | $ 150,983 | $ 145,604
Unrealized Gains | 84 |
Unrealized Losses | (12) | (68)
Estimated Fair Value | 151,055 | 145,536
Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 39,884 | 49,348
Estimated Fair Value | 39,884 | 49,348
Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 111,099 | 96,256
Unrealized Gains | 84 |
Unrealized Losses | (12) | (68)
Estimated Fair Value | 111,171 | 96,188
Cash | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 4,038 | 3,147
Estimated Fair Value | 4,038 | 3,147
Money Market Funds | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 27,854 | 44,002
Estimated Fair Value | 27,854 | 44,002
Corporate Debt Securities | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 7,992 | 2,199
Estimated Fair Value | 7,992 | 2,199
Corporate Debt Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 53,353 | 39,108
Unrealized Gains | 28 |
Unrealized Losses |  | (16)
Estimated Fair Value | 53,381 | 39,092
U.S. Treasuries | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 6,511 | 14,732
Unrealized Gains | 6 |
Unrealized Losses |  | (8)
Estimated Fair Value | 6,517 | 14,724
U.S. Government Agency Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 51,235 | 42,416
Unrealized Gains | 50 |
Unrealized Losses | (12) | (44)
Estimated Fair Value | $ 51,273 | $ 42,372

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