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STOCKHOLDERS' EQUITY (DEFICIT) AND COMPENSATION ARRANGEMENTS - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
May 20, 2025
Mar. 11, 2025
USD ($)
shares
Oct. 14, 2024
hurdle
$ / shares
Jun. 12, 2024
hurdle
$ / shares
Jan. 22, 2024
USD ($)
$ / shares
shares
Mar. 30, 2023
$ / shares
shares
Aug. 31, 2025
$ / shares
shares
Jun. 30, 2025
USD ($)
$ / shares
shares
May 31, 2025
USD ($)
$ / shares
shares
Apr. 30, 2025
shares
Oct. 31, 2024
Feb. 29, 2024
USD ($)
Sep. 30, 2025
USD ($)
hurdle
$ / shares
shares
Jul. 31, 2025
Sep. 30, 2025
USD ($)
hurdle
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total fair value of shares vested | $                             $ 0.4
Rights Offering                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Sale of stock, authorized amount | $         $ 80.0                    
Shares issued in transaction (in shares)         7,079,646                    
Subscription price (in usd per share) | $ / shares         $ 11.30                    
Rights offering amount | $         $ 80.0             $ 80.0      
Rights Offering | Backstop Party                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Shares issued in transaction (in shares)         3,100,000                    
Common stock, subscriptions amount (in shares)         7,100,000                    
Rights Offering | Other Stockholders                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Common stock, subscriptions amount (in shares)         9,700,000                    
Rights Offering, Basic Subscription Rights                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Shares issued in transaction (in shares)         4,574,113                    
Rights Offering, Over-subscription Privileges                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Shares issued in transaction (in shares)         2,505,533                    
RSUs                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Unrecognized compensation costs | $                         $ 7.3   $ 7.3
Weighted-average period of recognition (in years)                             1 year 3 months 18 days
Vesting of shares (in shares)                             304,279
Employee Stock Option                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting period (in years)           2 years                  
Stock option units issued (in shares)           3,500,000                  
Stock option units per share value (in usd per share) | $ / shares           $ 0.95                  
Granted (in usd per share) | $ / shares           $ 6.00                  
Expiration period (in years)           3 years                  
Risk-free interest rate                             4.10%
Dividend yield                             0.00%
2025 PSUs                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Unrecognized compensation costs | $                         $ 30.7   $ 30.7
Weighted-average period of recognition (in years)                             1 year 7 months 13 days
Number of stock price hurdles | hurdle                         4   4
Vesting of shares (in shares)                             0
Risk-free interest rate 3.91%                            
Dividend yield 0.00%                            
Expected volatility 98.88%                            
2025 PSUs | Share-Based Payment Arrangement, Tranche One                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting rights, percentage                           33.00%  
2025 PSUs | Share-Based Payment Arrangement, Tranche Two                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting rights, percentage                           33.00%  
2025 PSUs | Share-Based Payment Arrangement, Tranche Three                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting rights, percentage                           34.00%  
2025 PSUs | Stock Price, Hurdle One                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Stock hurdle price (in usd per share) | $ / shares                         $ 19.75   $ 19.75
2025 PSUs | Stock Price, Hurdle Two                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Stock hurdle price (in usd per share) | $ / shares                         26.76   26.76
2025 PSUs | Stock Price, Hurdle Three                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Stock hurdle price (in usd per share) | $ / shares                         31.01   31.01
2025 PSUs | Stock Price, Hurdle Four                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Stock hurdle price (in usd per share) | $ / shares                         $ 68.82   $ 68.82
Equity-classified 2024 Executive PSUs                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Unrecognized compensation costs | $                         $ 13.6   $ 13.6
Weighted-average period of recognition (in years)                             1 year 2 months 4 days
Stock hurdle price (in usd per share) | $ / shares             $ 31.01 $ 20.14 $ 14.86            
Vesting of shares (in shares)             299,335 269,865 287,115           848,408
Fair value of the awards before the modification | $               $ 2.2              
Risk-free interest rate     3.86% 4.46%                      
Dividend yield     0.00% 0.00%                      
Expected volatility     98.70% 95.73%                      
Equity-classified 2024 Executive PSUs | Share-Based Payment Arrangement, Tranche One                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting rights, percentage     33.00% 33.00%                      
Equity-classified 2024 Executive PSUs | Share-Based Payment Arrangement, Tranche Two                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting rights, percentage     33.00% 33.00%                      
Equity-classified 2024 Executive PSUs | Share-Based Payment Arrangement, Tranche Three                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting rights, percentage     34.00% 34.00%                      
Equity-classified 2024 Executive PSUs | Stock Price, Hurdle One                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Stock hurdle price (in usd per share) | $ / shares     $ 14.86 $ 14.86                      
Equity-classified 2024 Executive PSUs | Stock Price, Hurdle Two                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Number of stock price hurdles | hurdle     4 4                      
Stock hurdle price (in usd per share) | $ / shares     $ 20.14 $ 20.14                      
Equity-classified 2024 Executive PSUs | Stock Price, Hurdle Three                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Stock hurdle price (in usd per share) | $ / shares     31.01 31.01                      
Equity-classified 2024 Executive PSUs | Stock Price, Hurdle Four                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Stock hurdle price (in usd per share) | $ / shares     $ 68.82 $ 68.82                      
Liability-classified Executive PSUs                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Stock hurdle price (in usd per share) | $ / shares                 $ 14.86            
Vesting of shares (in shares)                 21,563           21,562
Payments of cash settlement | $                 $ 0.6            
Risk-free interest rate                     3.86%       3.71%
Dividend yield                     0.00%       0.00%
Expected volatility                     98.70%       98.59%
Incremental stock-based compensation expense | $                             $ 1.9
PSUs                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting of shares (in shares)                   0         0
Major Rocket Incentive Shares                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Number of shares available for issuance (in shares)   954,000                          
Unrecognized compensation costs | $   $ 9.3                          
Expiration period (in years)   3 years                          
Stock-based compensation expense | $                         $ 0.3   $ 0.8
Minimum | RSUs                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting period (in years)                             1 year
Minimum | Major Rocket Incentive Shares                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Share-based payment award, financial performance benchmarks | $   $ 10.0                          
Maximum | RSUs                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting period (in years)                             3 years
Maximum | Major Rocket Incentive Shares                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Share-based payment award, financial performance benchmarks | $   $ 25.0                          
2011 Plan                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Share-based payment award, shares authorized (in shares)                         20,775,000   20,775,000
Number of shares available for issuance (in shares)                         4,710,474   4,710,474