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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2011
Income Taxes [Line Items] |  |  |
Recognition of a valuation allowance against deferred tax assets in the U.S | $ 11,280 | $ 8,590 |
Net operating loss carry forwards, federal | 17,300 |  |
Net operating loss carry forwards, state | $ 14,000 |  |
Income tax examination, year under examination | 2008 |  |
Annual net operating loss carry forward limitation expiration year | 2027 |  |
Effective tax rate | 34.00% | 34.00% |
Annual Net Operating Loss Carry Forward Limitation |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carry forwards related to business combination | $ 7,400 |  |
Annual Net Operating Loss Carry Forward Limitation | U.S. federal | Internal Revenue Service (IRS) |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carry forwards subject to expiration |  |  | $ 299
Earliest Tax Year |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carry forwards expiration date | Dec. 31, 2019 |  |
Latest Tax Year |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carry forwards expiration date | Dec. 31, 2032 |  |

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