Quarterly report pursuant to Section 13 or 15(d)

Accrued Warranty - Schedule Product Warranty Accrual Included in Accrued Expenses (Details)

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Accrued Warranty - Schedule Product Warranty Accrual Included in Accrued Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Product Warranties Disclosures [Abstract]    
Balance at beginning of period, Accrued warranty $ 242 $ 338
Increase in warranty accrual 24 87
Change in liability for pre-existing warranties   (2)
Claims satisfied (23) (181)
Balance at ending of period, Accrued warranty $ 243 $ 242