XML 43 R31.htm IDEA: XBRL DOCUMENT v3.21.1
Accrued product warranty liability (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accrued product warranty liability [Roll Forward]    
Balance, beginning of period $ 140 $ 215
Warranties issued 5 45
Warranty settlements (29) (47)
Balance, end of period 116 $ 213
Accrued product warranty liability, current 98  
Other Liabilities [Member]    
Accrued product warranty liability [Roll Forward]    
Accrued product warranty liability, non-current $ 18  
Maximum [Member]    
Warranty [Abstract]    
Product warranty period 24 months