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Share-based compensation - Return Target Options Activity (Details) - Target-based stock options
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Options    
Outstanding, beginning of period (in shares) | shares 3,687,664  
Granted (in shares) | shares 0  
Exercised (in shares) | shares 0  
Forfeitures (in shares) | shares 0  
Outstanding, end of period (in shares) | shares 3,687,664 3,687,664
Options exercisable (in shares) | shares 0  
Vested or expected to vest (in shares) | shares 0  
Weighted‑ Average Exercise Price    
Outstanding, beginning of period (in dollars per share) | $ / shares $ 6.75  
Granted (in dollars per share) | $ / shares 0  
Exercised (in dollars per share) | $ / shares 0  
Forfeitures (in dollars per share) | $ / shares 0  
Outstanding, end of period (in dollars per share) | $ / shares 6.75 $ 6.75
Options exercisable (in dollars per share) | $ / shares 0  
Vested or expected to vest (in dollars per share) | $ / shares $ 0  
Weighted‑ Average Remaining Contractual Term (Years)    
Remaining term, options outstanding 7 years 3 months 18 days 7 years 9 months 18 days
Aggregate Intrinsic Value (in thousands)    
Outstanding | $ $ 98,904 $ 85,444
Exercised | $ 0  
Options exercisable | $ 0  
Vested or expected to vest | $ 0  
Unrecognized compensation expense    
Unrecognized compensation expense | $ $ 33,000  
Remaining term, options exercisable 0 years  
Remaining term, options vested or expected to vest 0 years