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Prepaid expenses and other current assets - Summary of prepaid expenses and other current assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Prepaid expenses and other current assets.    
Research and development $ 327 $ 110
Prepaid clinical trial related costs 215  
Insurance 1,867 1,454
Software licenses and other 608 1,417
Reimbursement receivable 581 780
Warranties 160 242
Accrued interest receivable 1,125  
Total prepaid expenses and other current assets $ 4,883 $ 4,003