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Long-Term Debt (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Capitalization, Long-term Debt [Line Items]      
Repayments of loans $ 277 $ 747 $ 355
Research and development arrangement, waiver of loan repayment   1,498  
French Ministry Of Research      
Schedule of Capitalization, Long-term Debt [Line Items]      
Proceeds from loans or conditional grants $ 815 $ 1,118