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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |
U.S. federal income tax rate |  |  | 21.00% |
Valuation allowance on federal deferred tax assets | $ 11,100,000 |  | $ 11,100,000 |
Provision (benefit) for income taxes | (2,426,000) | $ (6,698,000) | $ 976,000 | $ (10,741,000)
Percentage of provision (benefit) on pre-tax loss |  |  | 2.00% | (26.00%)
IRS [Member] | Tax Year 2015 [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Income tax examination, changes to financial position, results of operations or cash flow | 0 |  | $ 0 |
State and Local Jurisdiction [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Portion of state deferred tax assets, not able to be utilized before expiration | $ 5,200,000 |  | $ 5,200,000 |

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