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Balance sheet details (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Accrued expenses:    
Accrued professional services $ 6,026 $ 1,953
Accrued compensation and related benefits 1,859 1,108
Other accruals 205 318
Other current liabilities:    
Other payroll expenses 149 175
Customer deposit 21 21
Current portion of equipment financing 35 39
Total accrued expenses and other current liabilities $ 8,295 $ 3,614