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Restructuring Costs (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]          
Restructuring costs $ 50 $ 1,069 $ 203 $ 3,722  
Employee Severance | Lyon France Workforce Reduction          
Restructuring Cost and Reserve [Line Items]          
Expected number of positions eliminated (as a percent)         50.00%