Balance sheet details - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Prepaid expenses:
Prepaid services	$ 391	$ 125
Prepaid software	559	531
Prepaid rent	96	151
Prepaid commissions	268	84
Prepaid insurance	697	0
Other	89	156
Other current assets:
Directors and Officers insurance	1,449	0
Unbilled receivables	58	17
Security deposits	36	52
Total prepaid expenses and other current assets	$ 3,643	$ 1,116