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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |  |  |
Corporate tax rate |  | 21.00% | 35.00% | 35.00% |
Amounts related to the remeasurement of federal deferred tax assets and liabilities |  | $ 1,200,000 |  |  |
Amounts related to one-time transition tax on mandatory deemed repatriation of foreign earnings |  | 400,000 |  |  |
Cumulative foreign earnings from tax cuts and jobs act of 2017 |  | $ 22,600,000 |  |  |
Tax Cuts and Jobs Act of 2017, accounting complete |  | true |  |  |
Additional income tax expense due to tax cuts and jobs act of 2017 |  | $ 400,000 |  |  |
Long-term net deferred tax assets |  | 1,100,000 | $ 3,500,000 |  |
Long-term net deferred tax liabilities |  | 1,000,000 | 100,000 |  |
Valuation allowance |  | 2,574,000 | 2,686,000 | $ 2,193,000 | $ 1,534,000
Operating loss carryforwards related to a prior acquisition |  | 3,200,000 |  |  |
U.S. federal and state capital loss carryforwards |  | 6,200,000 |  |  |
Deferred tax assets, Capital loss carryforwards expires in 2020 |  | 1,600,000 |  |  |
Deferred tax assets, Capital loss carryforwards expires in 2021 |  | 1,400,000 |  |  |
Deferred tax assets, Capital loss carryforwards expires in 2022 |  | 3,200,000 |  |  |
Unremitted earnings of U.S. deferred tax liability of foreign subsidiaries |  | 0 |  |  |
Unremitted earnings |  | 13,800,000 |  |  |
Unrecognized tax benefits |  | 799,000 | $ 806,000 | 1,774,000 | $ 1,910,000
Unrecognized tax benefits, reversal |  |  |  | 31,000 |
Accrued interest and penalties related to uncertain tax positions |  |  |  | $ 100,000 |
Scenario Forecast [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Unrecognized tax benefits, reversal | $ 400,000 |  |  |  |
Additional Tax expense | $ 500,000 |  |  |  |
Foreign Tax Authority [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Operating loss carryforwards |  | $ 20,800,000 |  |  |

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