Quarterly report pursuant to Section 13 or 15(d)

Warranty (Details)

v3.19.1
Warranty (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Warranty [Abstract]    
Product warranty period 5 years  
Beginning balance $ 594 $ 603
Amounts charged (credited) to expense (13) 79
Actual warranty costs paid (11) (25)
Ending balance $ 570 $ 657