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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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 |  |  |
Estimated deferred tax liability on foreign earnings as result of the Tax Cuts and Jobs Act | 441,000 |  |  |
Total unrecognized tax benefits | 725,000 | $ 2,357,000 | $ 2,670,000 | $ 10,025,000
Unrecognized tax benefits affecting the company's effective income tax rate | 588,000 |  |  |
Unrecognized tax benefits, interest on income taxes accrued | 651,000 |  |  |
Unrecognized tax benefits, increase in interest on income taxes accrued | 136,000 |  |  |
Foreign Tax Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards, valuation allowance | 9,200,000 |  |  |
Operating loss carryforwards | 38,200,000 |  |  |
Increase in valuation allowance | 2,100,000 |  |  |
Operating loss carryforward, indefinite | 22,200,000 |  |  |
Operating loss carryforward, expiring | $ 16,000,000 |  |  |

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