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NET INCOME (LOSS) PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Numerator        
Net income attributable to FTS $ 89,576 $ 27,339 $ 118,698 $ 11,738
Less: Undistributed earnings attributable to convertible preferred stockholders (45,792) (20,969) (79,699) (11,738)
Less: Undistributed earnings attributable to convertible preferred stockholders (45,792) (20,969) (79,699) (11,738)
Net income attributable to common stockholders, basic and diluted 43,784 6,370 38,999 0
Net income attributable to common stockholders, basic and diluted $ 43,784 $ 6,370 $ 38,999 $ 0
Denominator        
Basic weighted average common shares attributable to FTS (in shares) 103,571,820 68,568,542 80,896,185 63,700,455
Add: effect of dilutive securities related to share-based payment awards (A) (in shares) 26,350,509 5,017,205 22,210,202 6,154,472
Diluted weighted average common shares attributable to FTS (in shares) 129,922,329 73,585,747 103,106,387 69,854,927
Net income per common share attributable to FTS, basic (USD per share) $ 0.42 $ 0.09 $ 0.48 $ 0.00
Net income per common share attributable to FTS, diluted (USD per share) $ 0.34 $ 0.09 $ 0.38 $ 0.00
Options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount 21,414,298 4,452,523 18,072,864 5,787,713
Warrant        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount 1,349,563 564,682 1,041,277 366,759
RSUs        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount   694,564   327,943
Restricted Stock Units Unvested        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount 3,586,648 0 3,096,061 0