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Other Accrued Liabilities, Accrued Warranty Costs (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Product Warranty Accrual [Roll Forward]      
Accrual at beginning of period $ 232 $ 238  
Additions charged to warranty expense 3 68  
Expiring warranties/claims satisfied (54) (34)  
Total 181 272  
Less: current portion (143) (183) $ (170)
Total long-term accrued warranty costs $ 38 $ 89  
Minimum [Member]      
Accrued warranty costs [Abstract]      
Standard warranty period 1 year    
Offered warranty period 3 years    
Maximum [Member]      
Accrued warranty costs [Abstract]      
Standard warranty period 2 years    
Offered warranty period 4 years