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Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | $ 183,216 | $ 145,604
Unrealized Gains | 10 |
Unrealized Losses | (10) | (68)
Estimated Fair Value | 183,216 | 145,536
Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 112,133 | 49,348
Estimated Fair Value | 112,133 | 49,348
Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 71,083 | 96,256
Unrealized Gains | 10 |
Unrealized Losses | (10) | (68)
Estimated Fair Value | 71,083 | 96,188
Cash | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 1,518 | 3,147
Estimated Fair Value | 1,518 | 3,147
Money Market Funds | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 102,616 | 44,002
Estimated Fair Value | 102,616 | 44,002
U.S. Treasuries | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 5,000 |
Estimated Fair Value | 5,000 |
U.S. Treasuries | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 1,999 | 14,732
Unrealized Losses |  | (8)
Estimated Fair Value | 1,999 | 14,724
Corporate Debt Securities | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 2,999 | 2,199
Estimated Fair Value | 2,999 | 2,199
Corporate Debt Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 42,999 | 39,108
Unrealized Gains | 10 |
Unrealized Losses | (2) | (16)
Estimated Fair Value | 43,007 | 39,092
U.S. Government Agency Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 26,085 | 42,416
Unrealized Losses | (8) | (44)
Estimated Fair Value | $ 26,077 | $ 42,372

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