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 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Product Warranties Disclosures [Abstract]    
Balance at beginning of period, Accrued warranty $ 338 $ 112
Increase in warranty accrual 32 889
Change in liability for pre-existing warranties   (28)
Claims satisfied (68) (635)
Balance at ending of period, Accrued warranty $ 302 $ 338