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Balance sheet details - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Prepaid expenses:    
Prepaid services $ 358 $ 391
Prepaid software 426 559
Prepaid rent 133 96
Prepaid commissions 206 268
Prepaid insurance 656 697
Other 384 89
Other current assets:    
Directors and Officers insurance 0 1,449
Unbilled receivables 0 58
Security deposits 37 36
Receivable research incentives 0 264
Total prepaid expenses and other current assets $ 2,200 $ 3,907