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Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | $ 145,604 | $ 191,934
Unrealized Losses | (68) | (80)
Estimated Fair Value | 145,536 | 191,854
Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 49,348 | 26,584
Estimated Fair Value | 49,348 | 26,584
Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 96,256 | 165,350
Unrealized Losses | (68) | (80)
Estimated Fair Value | 96,188 | 165,270
Cash | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 3,147 | 4,041
Estimated Fair Value | 3,147 | 4,041
Money Market Funds | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 44,002 | 22,543
Estimated Fair Value | 44,002 | 22,543
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 | 39,108 | 32,931
Unrealized Losses | (16) | (15)
Estimated Fair Value | 39,092 | 32,916
U.S. Treasuries | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 14,732 | 45,559
Unrealized Losses | (8) | (25)
Estimated Fair Value | 14,724 | 45,534
U.S. Government Agency Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 42,416 | 86,860
Unrealized Losses | (44) | (40)
Estimated Fair Value | $ 42,372 | $ 86,820

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