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Segment Reporting and Geographic Information - Loss from Operations (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Loss from operations    
Loss from operations $ (3,217) $ (2,714)
Catalyst    
Loss from operations    
Loss from operations (271) (558)
Heavy Duty Diesel Systems    
Loss from operations    
Loss from operations (784) (378)
Corporate, Non-Segment    
Loss from operations    
Loss from operations (2,117) (1,710)
Intersegment Eliminations    
Loss from operations    
Loss from operations $ (45) $ (68)