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Balance sheet details - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Prepaid expenses:    
Prepaid services $ 377 $ 391
Prepaid software 563 559
Prepaid rent 182 96
Prepaid commissions 87 268
Prepaid insurance 338 697
Other 142 89
Other current assets:    
Receivable research incentives 128 264
Security deposits 17 36
Directors and officers insurance 36 1,449
Unbilled receivables 0 58
Total prepaid expenses and other current assets $ 1,870 $ 3,907