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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Examination [Line Items] |  |  |  |  |  |
Income tax expense (benefit) from continuing operations | $ (528,000) | $ (495,000) | $ (495,000) | $ (1,023,000) | $ 2,000 | $ (1,062,000)
Effective tax rate |  |  |  |  | (0.29%) | (21.54%)
Net operating losses |  |  |  |  | $ 145,000,000 |
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 |  |  |  |  | 2016 2017 2018 |
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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