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Other Accrued Liabilities, Accrued Warranty Costs (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Product Warranty Accrual [Roll Forward]      
Accrual at beginning of period $ 113 $ 232  
Additions charged to warranty expense 4 3  
Expiring warranties/claims satisfied (32) (54)  
Total 85 181  
Less: current portion (63) (143) $ (87)
Total long-term accrued warranty costs $ 22 $ 38  
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