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Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | $ 140,386 | $ 145,604
Unrealized Gains | 108 |
Unrealized Losses |  | (68)
Estimated Fair Value | 140,494 | 145,536
Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 34,225 | 49,348
Estimated Fair Value | 34,225 | 49,348
Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 106,161 | 96,256
Unrealized Gains | 108 |
Unrealized Losses |  | (68)
Estimated Fair Value | 106,269 | 96,188
Cash | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 2,384 | 3,147
Estimated Fair Value | 2,384 | 3,147
Money Market Funds | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 29,343 | 44,002
Estimated Fair Value | 29,343 | 44,002
U.S. Treasuries | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 500 |
Estimated Fair Value | 500 |
U.S. Treasuries | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 1,493 | 14,732
Unrealized Gains | 1 |
Unrealized Losses |  | (8)
Estimated Fair Value | 1,494 | 14,724
Corporate Debt Securities | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 1,998 | 2,199
Estimated Fair Value | 1,998 | 2,199
Corporate Debt Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 77,794 | 39,108
Unrealized Gains | 78 |
Unrealized Losses |  | (16)
Estimated Fair Value | 77,872 | 39,092
U.S. Government Agency Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 26,874 | 42,416
Unrealized Gains | 29 |
Unrealized Losses |  | (44)
Estimated Fair Value | $ 26,903 | $ 42,372

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