Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Tax Credit Carryforward [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, General Business	$ 9
Income (loss) before income taxes	(1,970)	$ 2,666	$ 1,325
Valuation allowance, deferred tax asset, change in amount	6,879
Valuation allowance, decrease in expiration of reserved state tax credit-carryforwards	287
Valuation allowance, increase in net operating loss and credit carryforwards, tax deductions	258
Valuation allowance, amount	11,567	4,688
Change in valuation allowance	7,425	1,392	1,665
Undistributed earnings of foreign subsidiaries	14,543
Deferred Tax Assets, Tax Credit Carryforwards And Operating Loss Carryforwards
Tax Credit Carryforward [Line Items]
Valuation allowance, amount	454
Alternative Minimum Tax
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	54
Federal and State Tax Jurisdictions
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	1,571
Federal
Tax Credit Carryforward [Line Items]
Income (loss) before income taxes	(7,775)	(570)	907
Federal | Research Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	3,875
State Tax Authority
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	241
Change in valuation allowance	7,425
State Tax Authority | Research Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	3,529
Foreign Tax Authority
Tax Credit Carryforward [Line Items]
Income (loss) before income taxes	$ 5,805	$ 3,236	$ 418