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Income Taxes - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) Jurisdictions | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Line Items] |  |  |
Customary rate | 35.00% | 35.00% | 35.00%
Cumulative common stock ownership change over three year period that would limit federal and state net operating loss carry forwards | 50.00% |  |
State jurisdiction currently under review | Jurisdictions | 1 |  |
U.S. Federal |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss, Tax Credit Carryforward, Amount | $ 745,190 |  |
State Taxes |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss, Tax Credit Carryforward, Amount | 1,521,847 |  |
Valuation allowance on net operating loss carryforwards | $ 1,400,000 |  |

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- Definition Cumulative common stock ownership change over three year period that would limit federal and state net operating loss carry forwards. + References No definition available. + Details
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