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Revenue recognition - Contract assets and liabilities and liabilities activity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 15, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Revenue recognition            
Contract assets   $ 100   $ 100   $ 600
Contract liabilities $ 9,091 $ 38,172   $ 38,172   12,028
Contract balances            
Financial Designation, Predecessor and Successor [Fixed List] Predecessor Successor Successor Successor Successor  
Beginning balance $ 9,137     $ 12,028 $ 9,091 9,091
Additions 65     29,377   5,825
Recognized in revenue (106)     (2,895)   (2,285)
Marketing activities (5)     (338)   (603)
Ending balance $ 9,091 $ 38,172   $ 38,172   $ 12,028