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Income Taxes (Additional Information) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Tax Credit Carryforward [Line Items] |  |
Federal operating loss carryforwards | $ 251.5 |
State operating loss carryforwards | 200.0 |
Operating loss carryforwards, exercise of stock options | 1.4 |
Deferred income tax valuation |  | 100.00%
Increase in valuation allowance | 21.8 | $ 24.2
Domestic Tax Authority |  |
Tax Credit Carryforward [Line Items] |  |
Research and development tax credit carryforwards | 2.6 |
State and Local Jurisdiction |  |
Tax Credit Carryforward [Line Items] |  |
Research and development tax credit carryforwards | $ 2.5 |

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