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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Statutory federal rate | 21.00% | 21.00% | 21.00%
Increase (Decrease) in valuation allowance | $ 5,600 | $ (345) | $ 567
U.S. federal net operating loss carryforwards | 66,900 |  |
Foreign operating loss carryforwards | 27,000 |  |
Foreign withholding tax | 228 | 638 | 5,590
Unrecognized tax benefits including interest and penalties | 2,000 | 2,500 |
Unrecognized tax benefits that would impact effective rate | 1,600 | 2,200 |
Unrecognized tax benefits reduction to non-current deferred income tax assets | 627 | 230 |
Reduction of uncertain tax benefits related to certain liabilities for unrecognized tax benefits | 307 | 307 |
Accrued interest and penalties | 276 | 366 |
Income tax penalties and interest expense | (90) | $ (7) | $ 69
Maximum |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Estimated decrease in unrecognized tax benefit in next twelve months | 250 |  |
Domestic |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Operating loss carryforward, expiring | 41,700 |  |
Operating loss carryforward, no expiration | $ 25,200 |  |
Period to utilize the net operating loss carryforwards | 15 years |  |
NOL carryforward used in period | $ 23,700 |  |
Foreign |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Operating loss carryforward, expiring | 1,200 |  |
Operating loss carryforward, no expiration | $ 25,800 |  |

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