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Stock-based compensation - Schedule of restricted stock unit and performance stock unit activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Weighted Average Grant Date Fair Value        
Outstanding, beginning balance (in dollars per share) $ 11.97 $ 39.41 $ 15.69 $ 7.92
Granted (in dollars per share) 11.97 39.41 15.68  
Performance achievement adjustment (in dollars per share) 31.31      
Vested / released (in dollars per share) 39.26 15.69 11.64  
Forfeited (in dollars per share) 11.97   15.61  
Outstanding, ending balance (in dollars per share) $ 11.97 $ 39.41 $ 15.69  
Restricted stock units        
Shares        
Outstanding, beginning balance (in shares) 2,245,968 1,493,915 2,995,669  
Granted (in shares) 251,955 1,414,925 61,539  
Vested / released (in shares) (1,663,702) (662,872) (1,272,136)  
Forfeited (in shares) (105,008)   (291,157)  
Outstanding, ending balance (in shares) 729,213 2,245,968 1,493,915  
Weighted Average Grant Date Fair Value        
Outstanding, beginning balance (in dollars per share) $ 11.99 $ 11.99 $ 8.82 $ 8.38
Granted (in dollars per share) 11.64 14.05 24.35  
Vested / released (in dollars per share) 11.98 9.26 8.32  
Forfeited (in dollars per share) 11.25   8.14  
Outstanding, ending balance (in dollars per share) $ 11.99 $ 11.99 $ 8.82  
Performance stock units        
Shares        
Outstanding, beginning balance (in shares) 518,938 [1] 112,085 [2] 1,452,696  
Granted (in shares) 523,938 [1] 518,938 [1] 1,478,765 [2]  
Performance achievement adjustment (in shares) [3] 1,148,376      
Vested / released (in shares) (1,335,982) (112,085) (2,787,001)  
Forfeited (in shares) (32,375)   (32,375)  
Outstanding, ending balance (in shares) 822,895 [4] 518,938 [1] 112,085 [2]  
Performance stock units | Year 2021        
Weighted Average Grant Date Fair Value        
Performance factor percentage     271.00%  
Awards granted, period performance factor percentage     271.00%  
Performance stock units | Year 2022        
Weighted Average Grant Date Fair Value        
Performance factor percentage   100.00%    
Awards granted, period performance factor percentage   100.00%    
Performance achievement adjustment, period performance factor 256.00%      
Performance stock units | Year 2023        
Weighted Average Grant Date Fair Value        
Performance factor percentage 170.00%      
Awards granted, period performance factor percentage 100.00%      
Performance achievement adjustment, period performance factor 170.00%      
[1] Reported at 100% of the target shares granted
[2] Reported at the certified performance achievement at 271% of the target shares granted
[3] Reported at the certified performance achievement at 256% of the target shares granted in 2022 and at 170% of the target shares granted in 2023
[4] Reported at the certified performance achievement at 170% of the target shares granted