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Other accrued expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Other accrued expenses    
Inventory purchases $ 187 $ 568
Property and equipment purchases 308 229
Royalties 748 1,250
Professional services 701 2,126
Development costs 598 566
Tax liabilities 698 430
Other 1,559 1,317
Total accrued expenses $ 4,799 $ 6,486