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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