v3.26.3
Share-based compensation - Share options (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Additional Information          
Total share-based compensation expense $ 5,418 $ 8,771 $ 18,752 $ 27,811  
Stock option          
Number of Shares          
Outstanding number of shares at beginning     9,803,106    
Granted     2,805,346    
Exercised     (16,032)    
Expired     (345,260)    
Forfeited     (474,670)    
Outstanding number of shares at end 11,772,490   11,772,490   9,803,106
Number of shares, vested and expected to vest 11,772,490   11,772,490    
Number of shares, options exercisable 7,613,820   7,613,820    
Weighted Average Exercise Price          
Weighted average exercise price at beginning     $ 20.4    
Granted     5.55    
Exercised     0.46    
Expired     28.81    
Forfeited     13.98    
Weighted average exercise price at ending $ 16.9   16.9   $ 20.4
Weighted average exercise price, vested and expected to vest 16.9   16.9    
Weighted average exercise price, options exercisable $ 20.99   $ 20.99    
Weighted Average Contractual Term          
Weighted average contractual term, outstanding     6 years 21 days   6 years 2 months 19 days
Weighted average contractual term, vested and expected to vest     6 years 21 days    
Weighted average contractual term ,options exercisable     4 years 5 months 23 days    
Aggregate Intrinsic Value          
Aggregate intrinsic value outstanding $ 1,282   $ 1,282   $ 2,680
Aggregate intrinsic value, vested and expected to vest 1,282   1,282    
Aggregate intrinsic value, options exercisable 1,282   $ 1,282    
Additional Information          
Granted     $ 3.6 $ 8.56  
Exercised 0 0 $ 100 $ 0  
Total share-based compensation expense $ 3,500 $ 6,300 $ 11,800 $ 19,900