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Other Accrued Liabilities, Accrued Warranty Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Product Warranty Accrual [Roll Forward]          
Accrual at beginning of period $ 139 $ 291 $ 232 $ 238  
Additions charged to warranty expense 37 26 46 169  
Expiring warranties/claims satisfied (41) (61) (143) (151)  
Total 135 256 135 256  
Less: current portion (107) (179) (107) (179) $ (170)
Total long-term accrued warranty costs $ 28 $ 77 $ 28 $ 77  
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