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Balance sheet details - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Prepaid expenses:    
Prepaid services $ 348 $ 391
Prepaid software 403 559
Prepaid rent 160 96
Prepaid commissions 223 268
Prepaid insurance 871 697
Other 128 89
Other current assets:    
Directors and Officers insurance 580 1,449
Unbilled receivables 59 58
Security deposits 42 36
Receivable research incentives 328 264
Total prepaid expenses and other current assets $ 3,142 $ 3,907