Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses - Schedule of Accrued Expenses (Details)

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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]        
Compensation and related benefits $ 729 $ 2,602    
Accrued warranty (Note 7) 243 242 $ 242 $ 338
Accrued services 1,241 1,504    
Accrued expenses $ 2,213 $ 4,348