v3.26.1
SHARE-BASED COMPENSATION - Restricted share units activities (Details) - Unvested restricted share units
12 Months Ended
Dec. 31, 2025
$ / shares
shares
Number of shares  
Unvested balance at beginning of period (in shares) | shares 2,753,342
Granted (in shares) | shares 6,339,600
Vested (in shares) | shares (1,023,514)
Forfeited (in shares) | shares (398,900)
Unvested balance at end of period (in shares) | shares 7,670,528
Weighted average grant date fair value  
Unvested balance at beginning of period (in dollars per share) | $ / shares $ 2.05
Granted (in dollars per share) | $ / shares 0.89
Vested (in dollars per share) | $ / shares 3.11
Forfeited (in dollars per share) | $ / shares 1.15
Unvested balance at end of period (in dollars per share) | $ / shares $ 1