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Marketable Securities - Summary of Cash Equivalents and Available-for-Sale Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Cash and cash equivalents | $ 22,061 | $ 69,482 | $ 6,030 | $ 10,186
Total cash equivalents | 18,992 | 65,937 |  |
Amortized Cost | 139,416 | 205,440 |  |
Gross Unrealized Gains | 76 | 51 |  |
Gross Unrealized (Losses) | (26) | (36) |  |
Estimated Fair Value | 139,466 | 205,455 |  |
Available-for-sale securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized Cost | 120,424 | 139,504 |  |
Gross Unrealized Gains | 76 | 50 |  |
Gross Unrealized (Losses) | (26) | (36) |  |
Estimated Fair Value | 120,474 | 139,518 |  |
Money market funds [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Cash and cash equivalents | 18,992 | 25,070 |  |
Total cash equivalents | 18,992 | 25,070 |  |
Commercial paper securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Cash and cash equivalents |  | 2,000 |  |
Total cash equivalents |  | 2,000 |  |
Commercial paper securities [Member] | Available-for-sale securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized Cost | 23,112 | 30,667 |  |
Gross Unrealized Gains | 73 | 50 |  |
Estimated Fair Value | 23,185 | 30,717 |  |
Cash equivalents [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Cash and cash equivalents | 18,992 | 65,936 |  |
Gross Unrealized Gains |  | 1 |  |
Total cash equivalents | 18,992 | 65,937 |  |
U.S. government sponsored entity debt securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Cash and cash equivalents |  | 38,866 |  |
Gross Unrealized Gains |  | 1 |  |
Total cash equivalents |  | 38,867 |  |
U.S. government sponsored entity debt securities [Member] | Available-for-sale securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized Cost | 87,307 | 91,562 |  |
Gross Unrealized Gains | 3 |  |  |
Gross Unrealized (Losses) | (25) | (24) |  |
Estimated Fair Value | 87,285 | 91,538 |  |
Corporate debt securities [Member] | Available-for-sale securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized Cost | 10,005 | 17,275 |  |
Gross Unrealized (Losses) | (1) | (12) |  |
Estimated Fair Value | $ 10,004 | $ 17,263 |  |

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