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Prepaid expenses and other current assets - Summary of prepaid expenses and other current assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Prepaid expenses and other current assets.    
Research and development   $ 110
Prepaid clinical trial related costs $ 791  
Insurance 884 1,454
Software licenses and other 1,123 1,417
Reimbursement receivable 610 780
Warranties 202 242
Accrued interest receivable 855  
Total prepaid expenses and other current assets $ 4,465 $ 4,003