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Marketable Securities - Summary of Cash Equivalents and Available-for-Sale Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Cash and cash equivalents | $ 69,482 | $ 6,030 | $ 10,186 | $ 21,679
Total cash equivalents | 65,937 | 3,182 |  |
Amortized Cost | 205,440 | 223,399 |  |
Gross Unrealized Gains | 51 | 33 |  |
Gross Unrealized (Losses) | (36) | (58) |  |
Estimated Fair Value | 205,455 | 223,374 |  |
Available-for-sale securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized Cost | 139,504 | 220,217 |  |
Gross Unrealized Gains | 50 | 33 |  |
Gross Unrealized (Losses) | (36) | (58) |  |
Estimated Fair Value | 139,518 | 220,192 |  |
Money market funds [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Cash and cash equivalents | 25,070 | 3,182 |  |
Total cash equivalents | 25,070 | 3,182 |  |
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 | 30,667 | 33,715 |  |
Gross Unrealized Gains | 50 | 33 |  |
Estimated Fair Value | 30,717 | 33,748 |  |
Cash equivalents [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Cash and cash equivalents | 65,936 | 3,182 |  |
Gross Unrealized Gains | 1 |  |  |
Total cash equivalents | 65,937 | 3,182 |  |
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 | 91,562 | 163,671 |  |
Gross Unrealized (Losses) | (24) | (40) |  |
Estimated Fair Value | 91,538 | 163,631 |  |
Corporate debt securities [Member] | Available-for-sale securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized Cost | 17,275 | 22,831 |  |
Gross Unrealized (Losses) | (12) | (18) |  |
Estimated Fair Value | $ 17,263 | $ 22,813 |  |

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