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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Loss Carryforwards [Line Items] |  |  |  |
Provisional income tax expense as result of Tax Cuts and Jobs Act |  | $ 508,000 |  |
Provisional transition tax as result of the Tax Cuts and Jobs Act |  | 0 |  |
Income tax benefit due to remeasure of foreign deferred tax liabilities as result of the Tax Cuts and Jobs Act |  | 173,000 |  |
Income tax expense due to remeasure of deferred taxes as result of the Tax Cuts and Jobs Act |  | 681,000 |  |
Income tax expense as result of 2017 Tax Cuts and Jobs Act | $ 508,000 |  |  |
Unrecognized deferred tax liability | 498,000 |  |  |
Total unrecognized tax benefits | 239,000 | $ 725,000 | $ 2,357,000 | $ 2,670,000
Unrecognized tax benefits affecting the company's effective income tax rate | 213,000 |  |  |
Unrecognized tax benefits, interest on income taxes accrued | 212,000 |  |  |
Unrecognized tax benefits, increase in interest on income taxes accrued | 34,000 |  |  |
Foreign Tax Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards, valuation allowance | 9,700,000 |  |  |
Operating loss carryforwards | 40,600,000 |  |  |
Increase in valuation allowance | 474,000 |  |  |
Operating loss carryforward, indefinite | 24,000,000 |  |  |
Operating loss carryforward, expiring | $ 16,500,000 |  |  |

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