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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |  |
U.S. federal income tax rate |  |  |  | 21.00% |
Tax reform adjustments to provision for income taxes |  | $ 0 |  |  |
Provision (benefit) for income taxes | $ (483,000) |  | $ (2,426,000) | $ (5,816,000) | $ 976,000
Percentage of benefit/provision on pre-tax loss |  |  |  | 14.00% | 2.00%
State and Local Jurisdiction [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Portion of state deferred tax assets, not able to be utilized | $ 3,800,000 |  |  | $ 3,800,000 |
Federal [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Deferred tax assets valuation allowance |  |  |  | $ 8,900,000 |

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