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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net tax benefit | $ (2,799,000) | $ (6,719,000) | $ (1,890,000) | $ (1,560,000) | $ (3,386,000) | $ (6,723,000) | $ (1,610,000) | $ (2,249,000) |  |  | $ (12,968,000) | $ (13,968,000) | $ (14,261,000)
Federal corporate tax rate |  |  |  |  |  |  |  | 35.00% |  | 21.00% | 21.00% | 24.50% | 35.00%
Non-cash adjustment to income tax expense |  |  |  |  |  |  |  |  |  |  |  | $ 805,000 |
Deferred tax asset | 2,300,000 |  |  |  |  |  |  |  |  |  | $ 2,300,000 |  |
Decrease in uncertain tax positions |  |  |  |  |  |  |  |  |  |  |  |  | $ 264,000
Effective tax rate impact on prior year tax position |  |  |  |  |  |  |  |  |  |  |  |  | 177,000
Unrecognized tax benefits | 0 |  |  |  | $ 0 |  |  |  |  | $ 0 | 0 | $ 0 |
Domestic Country |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss (NOL) carryforwards | $ 46,500,000 |  |  |  |  |  |  |  | $ 0 |  | $ 46,500,000 |  | $ 0
Minimum [Member] | State And Local Jurisdiction |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating loss carry forwards expiration year |  |  |  |  |  |  |  |  |  |  | 2029 |  |
Maximum [Member] | State And Local Jurisdiction |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating loss carry forwards expiration year |  |  |  |  |  |  |  |  |  |  | 2032 |  |
British Virgin Islands [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net tax benefit |  |  |  |  |  |  |  |  | $ 1,800,000 |  |  |  |

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