Income Taxes Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income tax provision (benefit)	$ 300	$ 1,382	$ (722)	$ 2,590
Cumulative valuation allowance	61,400		61,400
Decrease in net deferred tax liabilities			380	$ 190
Deferred tax liability recorded associated with unremitted earnings of foreign subsidiary no longer considered indefinitely reinvested	4,900		4,900
Undistributed earnings of Swiss subsidiary	97,600		97,600
Repatriation of Swiss accumulated earnings	$ 10,000		$ 10,000
Withholding tax percentage	5.00%		5.00%