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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax [Line Items] |  |  |  |
Deferred tax asset, valuation allowance | $ (63,612) | $ (58,781) |  |
Number of years cumulative pre-tax loss | 3 years |  |  |
Unrecognized tax benefits | $ 10,359 | $ 8,861 | $ 7,835 | $ 5,897
Uncertain tax benefits that, if realized, would affect the effective tax rate | 8,900 |  |  |
Accrued interest and penalties | 1,200 |  |  |
Increase in accrued interest and penalties | 100 |  |  |
Operating loss carryforwards state | 91,100 |  |  |
Operating loss carryforwards federal | $ 90,400 |  |  |
Federal and state net operating loss carryforwards, expiring year | 2035 |  |  |
Federal research and development tax credits | $ 3,300 |  |  |
State research and development tax credits | 3,000 |  |  |
Operating loss carryforwards foreign | $ 37,600 |  |  |
Foreign net operating loss carryforward expiration year | 2018 |  |  |
Federal research and development tax credits [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Federal research and development tax credits expiration year | 2035 |  |  |

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