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Revenue recognition - Contract assets and liabilities and liabilities activity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Revenue recognition    
Contract assets   $ 32
Contract liabilities $ 37,022 $ 38,445
Contract balances    
Beginning balance 38,445  
Additions 377  
Recognized in revenue (1,276)  
Marketing activities (524)  
Ending balance $ 37,022