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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Income Tax Examination [Line Items] |  |
Income tax expense (benefit) | $ 12,000 | $ 38,000
Effective tax rate | 0.24% | 0.91%
Corporate federal income tax rate | 21.00% | 35.00%
Decrease in net deferred tax assets | $ 20,000,000 |
Federal and state Net Operating Losses | $ 147,000,000 |
Year of expiration of net operating loss carryforward expiration year | 2027 |
Specified time period for ownership change | 3 years |
Accruals related to uncertainties tax positions | $ 0 | $ 0
Tax year remain subject to examination | 2015 2016 2017 |
Minimum [Member] |  |
Income Tax Examination [Line Items] |  |
Percentage of ownership change | 50.00% |
Percentage of change in ownership of shareholders | 1.00% |
Maximum [Member] |  |
Income Tax Examination [Line Items] |  |
Percentage of change in ownership of shareholders | 5.00% |

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