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Balance Sheet Components - Schedule of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Accrued liabilities    
Payroll-related expenses $ 1,611 $ 2,845
Inventory 139 177
Other 415 557
Total accrued liabilities $ 2,165 $ 3,579