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Subsequent events (Details) - GDI - ChaSerg - shares
shares in Thousands
 1 Months Ended
Mar. 05, 2020
Oct. 31, 2021
Subsequent Event [Line Items]    
Business acquisition, number of shares issued (in shares) 26,149  
Subsequent Event    
Subsequent Event [Line Items]    
Business acquisition, number of shares issued (in shares)   100
Shares released from escrow (in shares)   900