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
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]      
Compensation and related benefits $ 725 $ 2,602  
Accrued warranty (Note 7) 237 242 $ 338
Accrued services 1,059 1,504  
Accrued expenses $ 2,021 $ 4,348