Long-Term Debt (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Capitalization, Long-term Debt [Line Items]
Proceeds from loans or conditional grants	$ 0	$ 0	$ 19,333
Research and Development Arrangement with Federal Government, Costs Incurred, Net	747	355	$ 475
Research and Development Arrangement with Federal Government, Customer Funding to Offset Costs Incurred	1,498
French Ministry Of Research [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Proceeds from loans or conditional grants	$ 1,118	$ 3,717