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Marketable Securities - Schedule of Investments (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Cash and cash equivalents | $ 69,837 | $ 22,061 | $ 12,955 | $ 69,482
Amortized Cost | 257,915 | 139,416 |  |
Gross Unrealized Gains |  | 76 |  |
Gross Unrealized (Losses) | (113) | (26) |  |
Estimated Fair Value | 257,802 | 139,466 |  |
Available-for-sale securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized Cost | 196,530 | 120,424 |  |
Gross Unrealized Gains |  | 76 |  |
Gross Unrealized (Losses) | (113) | (26) |  |
Estimated Fair Value | 196,417 | 120,474 |  |
Money market funds [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Cash and cash equivalents | 61,385 | 18,992 |  |
Total cash equivalents | 61,385 | 18,992 |  |
Cash equivalents [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Cash and cash equivalents | 61,385 | 18,992 |  |
Total cash equivalents | 61,385 | 18,992 |  |
Commercial paper securities [Member] | Available-for-sale securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized Cost | 65,465 | 23,112 |  |
Gross Unrealized Gains |  | 73 |  |
Gross Unrealized (Losses) | (21) |  |  |
Estimated Fair Value | 65,444 | 23,185 |  |
Corporate debt securities [Member] | Available-for-sale securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized Cost | 64,943 | 10,005 |  |
Gross Unrealized (Losses) | (36) | (1) |  |
Estimated Fair Value | 64,907 | 10,004 |  |
U.S. government sponsored entity debt securities [Member] | Available-for-sale securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized Cost | 66,122 | 87,307 |  |
Gross Unrealized Gains |  | 3 |  |
Gross Unrealized (Losses) | (56) | (25) |  |
Estimated Fair Value | $ 66,066 | $ 87,285 |  |

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