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Restructuring and Integration Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Restructuring and integration activities [Roll Forward]        
Exit activity liability, beginning of period     $ 179  
Restructuring and integration costs provided for during 2021 $ 166 $ 250 166 $ 464
Cash payments     (256)  
Exit activity liability, end of period 89   89  
Soot Sensor Product Line Relocation [Member]        
Restructuring and integration activities [Roll Forward]        
Cash payments     (166)  
Integration Costs [Abstract]        
Total relocation expected expenses 400   $ 400  
Soot Sensor Product Line Relocation [Member] | Maximum [Member]        
Integration Costs [Abstract]        
Expected period for completion of relocation     12 months  
Plant Rationalization Program [Member]        
Restructuring and integration activities [Roll Forward]        
Cash payments     $ (90)  
Exit activity liability, end of period 89   89  
Workforce Reduction [Member]        
Restructuring and integration activities [Roll Forward]        
Exit activity liability, beginning of period     179  
Restructuring and integration costs provided for during 2021     0  
Cash payments     (90)  
Exit activity liability, end of period 89   89  
Other Exit Costs [Member]        
Restructuring and integration activities [Roll Forward]        
Exit activity liability, beginning of period     0  
Restructuring and integration costs provided for during 2021     166  
Cash payments     (166)  
Exit activity liability, end of period $ 0   $ 0