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Share-based compensation - Service Based Options Activity (Details) - Service-based stock option - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Options    
Outstanding, beginning of period (in shares) 1,215,822  
Granted (in shares) 0  
Exercised (in shares) (19,937)  
Forfeitures (in shares) 0  
Outstanding, end of period (in shares) 1,195,885 1,215,822
Options exercisable (in shares) 1,156,009  
Vested or expected to vest (in shares) 1,195,885  
Weighted‑ Average Exercise Price    
Outstanding, beginning of period (in dollars per share) $ 5.70  
Granted (in dollars per share) 0  
Exercised (in dollars per share) 8.21  
Forfeitures (in dollars per share) 0  
Outstanding, end of period (in dollars per share) 5.66 $ 5.70
Options exercisable (in dollars per share) 5.57  
Vested or expected to vest (in dollars per share) $ 5.66  
Weighted‑ Average Remaining Contractual Term (Years)    
Remaining term, options outstanding 4 years 5 years 1 month 6 days
Remaining term, options exercisable 3 years 10 months 24 days  
Remaining term, options vested or expected to vest 4 years  
Aggregate Intrinsic Value (in thousands)    
Outstanding $ 16,459 $ 18,968
Options exercisable 16,012  
Vested or expected to vest $ 16,459