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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, 2020 | Dec. 31, 2019
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Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | $ 129,170 | $ 150,983
Unrealized Gains | 376 | 84
Unrealized Losses | (13) | (12)
Estimated Fair Value | 129,533 | 151,055
Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 37,899 | 39,884
Estimated Fair Value | 37,899 | 39,884
Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 91,271 | 111,099
Unrealized Gains | 376 | 84
Unrealized Losses | (13) | (12)
Estimated Fair Value | 91,634 | 111,171
Cash | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 11,034 | 4,038
Estimated Fair Value | 11,034 | 4,038
Money Market Funds | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 26,865 | 27,854
Estimated Fair Value | 26,865 | 27,854
Corporate Debt Securities | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost |  | 7,992
Estimated Fair Value |  | 7,992
Corporate Debt Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 35,321 | 53,353
Unrealized Gains | 37 | 28
Unrealized Losses | (13) |
Estimated Fair Value | 35,345 | 53,381
U.S. Treasuries | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 6,511 | 6,511
Unrealized Gains | 86 | 6
Estimated Fair Value | 6,597 | 6,517
U.S. Government Agency Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 49,439 | 51,235
Unrealized Gains | 253 | 50
Unrealized Losses |  | (12)
Estimated Fair Value | $ 49,692 | $ 51,273

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