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Other Accrued Liabilities, Accrued Warranty Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Product Warranty Accrual [Roll Forward]          
Accrual at beginning of period $ 181 $ 272 $ 232 $ 238  
Additions charged to warranty expense 6 75 9 143  
Expiring warranties/claims satisfied (48) (56) (102) (90)  
Total 139 291 139 291  
Less: current portion (119) (194) (119) (194) $ (170)
Total long-term accrued warranty costs $ 20 $ 97 $ 20 $ 97  
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