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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, 2019 | Dec. 31, 2018
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Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | $ 174,909 | $ 145,604
Unrealized Gains | 67 |
Unrealized Losses | (30) | (68)
Estimated Fair Value | 174,946 | 145,536
Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 37,297 | 49,348
Estimated Fair Value | 37,297 | 49,348
Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 137,612 | 96,256
Unrealized Gains | 67 |
Unrealized Losses | (30) | (68)
Estimated Fair Value | 137,649 | 96,188
Cash | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 3,565 | 3,147
Estimated Fair Value | 3,565 | 3,147
Money Market Funds | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 33,732 | 44,002
Estimated Fair Value | 33,732 | 44,002
U.S. Treasuries | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 1,495 | 14,732
Unrealized Gains | 2 |
Unrealized Losses |  | (8)
Estimated Fair Value | 1,497 | 14,724
U.S. Government Agency Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 58,718 | 42,416
Unrealized Gains | 23 |
Unrealized Losses | (22) | (44)
Estimated Fair Value | 58,719 | 42,372
Corporate Debt Securities | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost |  | 2,199
Estimated Fair Value |  | 2,199
Corporate Debt Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 77,399 | 39,108
Unrealized Gains | 42 |
Unrealized Losses | (8) | (16)
Estimated Fair Value | $ 77,433 | $ 39,092

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