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Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accrued Liabilities Current [Abstract]    
Compensation $ 2,911 $ 2,971
Professional services 532 1,271
Warranty 35 79
Other 726 249
Total $ 4,204 $ 4,570