v3.25.4
EQUITY - Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Numerator            
Net income attributable to FTS $ 89,576 $ 27,339 $ 118,698 $ 11,738 $ 17,214 $ (47,935)
Less: Undistributed earnings attributable to convertible preferred stockholders (45,792) (20,969) (79,699) (11,738) (17,214) 0
Less: Undistributed earnings attributable to convertible preferred stockholders (45,792) (20,969) (79,699) (11,738) (17,214) 0
Net income attributable to common stockholders, basic and diluted 43,784 6,370 38,999 0 0 (47,935)
Net income attributable to common stockholders, basic and diluted $ 43,784 $ 6,370 $ 38,999 $ 0 $ 0 $ (47,935)
Denominator            
Basic weighted average common shares attributable to FTS (in shares) 103,571,820 68,568,542 80,896,185 63,700,455 65,020,119 51,305,065
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 7,617,338 0
Diluted weighted average common shares attributable to FTS (in shares) 129,922,329 73,585,747 103,106,387 69,854,927 72,637,457 51,305,065
Net income per common share attributable to FTS, basic (USD per share) $ 0.42 $ 0.09 $ 0.48 $ 0.00 $ 0.00 $ (0.93)
Net income per common share attributable to FTS, diluted (USD per share) $ 0.34 $ 0.09 $ 0.38 $ 0.00 $ 0 $ (0.93)
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 7,132,282  
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 1,041,277 366,759 485,056  
Share-Based Payment Arrangement            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Antidilutive securities excluded from computation of earnings per share, amount           3,609,301