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Balance sheet information - Schedule Of Inventory Valuation Reserves (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Balance, end of period $ (868)  
Bio Ventus LLC    
Balance, beginning of period (532) $ (570)
Provision for losses (904) (870)
Write-offs 568 908
Balance, end of period $ (868) $ (532)