Income Taxes - Components of Tax Provision and Reconciliation to Statutory Federal Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Components of domestic and foreign income before income taxes
Pretax income (loss) before income taxes, U.S.	$ (946)	$ (957)
Pretax income (loss) before income taxes, Foreign	9,937	6,209
Total	8,991	5,252
Income Tax Expense (Benefit), Continuing Operations, by Jurisdiction
Current	2,798	1,660
Deferred	(130)	(266)
Provision for income taxes	$ 2,668	$ 1,394
Effective income tax rate (as a percent)	29.70%	26.50%
U.S. Federal income tax statutory rate	$ 3,036	$ 1,786
Foreign income tax rate differential	(1,566)	(966)
Tax credits	(248)
State income tax (net of federal benefit)	150
Permanent items	1,813	408
Other	273	(137)
Change in valuation allowance	(790)	303
Provision for income taxes	2,668	1,394
Income tax benefit recorded related to reported losses on domestic operations	0
Valuation allowance on deferred tax assets	$ 13,406	$ 16,130
Czech Republic
Income Tax
Corporate income tax on adjusted net income (as a percent)	19.00%
Foreign
Income Tax Expense (Benefit), Continuing Operations, by Jurisdiction
Net operating loss carry forwards	$ 358
U.S.
Income Tax Expense (Benefit), Continuing Operations, by Jurisdiction
Net operating loss carry forwards	35,077
Valuation allowance on deferred tax assets	$ 13,406
Germany
Income Tax
Corporate income tax on adjusted net income (as a percent)	30.00%	30.00%
State
Income Tax Expense (Benefit), Continuing Operations, by Jurisdiction
Net operating loss carry forwards	$ 13,078
Czech | Maximum
Income Tax Expense (Benefit), Continuing Operations, by Jurisdiction
Percentage of total tax expense (benefit) recorded related to properties by country	100.00%