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Restructuring Costs (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]          
Restructuring costs $ 65 $ (549) $ 268 $ 3,173  
Charges for employee severance, benefits and other     $ 268 $ 3,722  
Curtailment gain   $ 549      
Employee Severance | Lyon France Workforce Reduction          
Restructuring Cost and Reserve [Line Items]          
Expected number of positions eliminated (as a percent)         50.00%