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Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accrued Liabilities Current [Abstract]    
Compensation $ 2,971 $ 3,972
Professional services 1,271 498
Warranty 79 58
Other 249 250
Total $ 4,570 $ 4,778