Quarterly report pursuant to Section 13 or 15(d)

SIGNIFICANT ACCOUNTING POLICIES - Accrued warranties and related costs (Details)

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SIGNIFICANT ACCOUNTING POLICIES - Accrued warranties and related costs (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Changes in the Company's accrued warranties and related costs    
Beginning accrued warranty expense $ 1,133 $ 2,114
Current period claims (236) (223)
Provision for current period sales 256 357
Ending accrued warranty expense $ 1,153 $ 2,248