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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |
Deferred tax assets, net operating loss carryforwards | $ 1,446,000 | $ 2,623,000 |
Benefit of net operating loss carryforwards | 5,900,000 |  |
Unrecognized tax benefit that would affect the effective tax rate | 2,700,000 |  |
Uncertain tax positions, interest expense and penalties accrued | $ 300,000 |  |
Federal corporate tax rate | 21.00% | 35.00% | 35.00%
Decrease in total income tax expense (benefit), due to tax rate change | $ (810,000) | $ (3,386,000) |
Tax benefit recognized, due to tax rate change | 800,000 | $ 3,800,000 |
Tax expense offset amount | 400,000 |  |
Minimum [Member] |  |  |
Income Taxes [Line Items] |  |  |
Decrease in unrecognized tax benefits, net of penalties and interest | 0 |  |
Maximum [Member] |  |  |
Income Taxes [Line Items] |  |  |
Decrease in unrecognized tax benefits, net of penalties and interest | $ 1,500,000 |  |

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