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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