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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax [Line Items] |  |  |
Income taxes payable | $ 4,707,000 | $ 384,000 |
Income tax rate | 21.00% | 21.00% | 21.00%
Remaining minimum tax credit carryforward, cash benefit | $ 2,054,000 |  |
Net change in total state valuation allowance | 2,226,000 | $ 1,032,000 |
Valuation allowance for deferred tax assets | 20,997,000 | 22,902,000 |
Undistributed earnings of subsidiaries | 21,126,000 |  |
Deferred tax liabilities foreign withholding taxes | 1,056,000 | 1,191,000 |
Current income tax expense (benefit) related to current period earnings | 152,000 |  |
Unrecognized tax benefits | 4,966,000 | 4,450,000 | $ 3,207,000
Income tax penalties and interest expense | 173,000 | 334,000 |
Expect to decrease in unrecognized tax benefits in next twelve months | 1,340,000 |  |
State and Local Jurisdiction [Member] |  |  |
Income Tax [Line Items] |  |  |
Net operating loss carry forwards | 991,054,000 |  |
Amounts of credits available to offset income tax | 117,000 |  |
Valuation allowance for deferred tax assets | 321,000 | 0 |
Net change in total state valuation allowance | 320,000 | 0 |
Foreign Tax Authority |  |  |
Income Tax [Line Items] |  |  |
Net operating loss carry forwards | 44,207,000 |  |
Amounts of credits available to offset income tax | $ 179,000 |  |
Earliest Tax Year [Member] | Foreign Tax Authority |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards expiration start year | 2021 |  |
Latest Tax Year [Member] | Foreign Tax Authority |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards expiration start year | 2029 |  |
US [Member] |  |  |
Income Tax [Line Items] |  |  |
Net operating loss carry forwards | $ 236,584,000 |  |
Amounts of credits available to offset income tax | $ 1,205,000 |  |
US [Member] | Earliest Tax Year [Member] |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards expiration start year | 2027 |  |
US [Member] | Latest Tax Year [Member] |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards expiration start year | 2037 |  |
Internal Revenue Service IRS [Member] |  |  |
Income Tax [Line Items] |  |  |
Net operating loss carry forwards | $ 38,250,000 |  |
Puerto Rico Corporate [Member] |  |  |
Income Tax [Line Items] |  |  |
Valuation allowance for deferred tax assets | $ 20,676,000 | $ 22,902,000 |

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