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COMPENSATION ARRANGEMENTS - Additional Information (Details) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
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May 20, 2025 | Mar. 11, 2025 USD ($) shares | Oct. 14, 2024 hurdle $ / shares | Jun. 12, 2024 hurdle $ / shares | Mar. 30, 2023 $ / shares shares | May 31, 2025 USD ($) $ / shares shares | Apr. 30, 2025 shares | Oct. 31, 2024 | Jun. 30, 2024 shares | Dec. 31, 2025 USD ($) hurdle $ / shares shares | Jul. 31, 2025 | Dec. 31, 2025 USD ($) hurdle $ / shares shares | Dec. 31, 2024 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Jun. 30, 2025 $ / shares | Aug. 31, 2011 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available for issuance (in shares) | shares |  |  |  |  |  |  |  |  |  | 100,500,000 |  | 100,500,000 |  |  |  |
Stock option units issued (in shares) | shares |  |  |  |  | 3,500,000 |  |  |  |  |  |  | 0 | 0 |  |  |
Stock option units per share value (in usd per share) |  |  |  |  | $ 0.95 |  |  |  |  |  |  |  |  |  |  |
Granted (in usd per share) |  |  |  |  | $ 6.00 |  |  |  |  |  |  |  |  |  |  |
Fair value of options vested | $ |  |  |  |  |  |  |  |  |  |  |  | $ 400,000 | $ 2,200,000 | $ 800,000 |  |
Total stock-based compensation expense | $ |  |  |  |  |  |  |  |  |  |  |  | $ 37,774,000 | 26,734,000 | 14,481,000 |  |
United States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined contribution plan, employer matching contribution, percent of match |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Defined contribution plan, employer matching contribution, percent of employees' eligible compensation |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |
Defined contribution plan, vesting period |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Defined contribution plan, cost | $ |  |  |  |  |  |  |  |  |  |  |  | $ 2,400,000 | $ 2,900,000 | $ 1,900,000 |  |
ESPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available for issuance (in shares) | shares |  |  |  |  |  |  |  |  |  | 1,000,000 |  | 1,000,000 |  |  |  |
Shares issued under ESPP (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 12,594 | 11,612 | 45,879 |  |
RSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value, granted (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 13.43 | $ 10.56 | $ 5.26 |  |
Stock issued during period, value, restricted stock award, gross | $ |  |  |  |  |  |  |  |  |  |  |  | $ 8,300,000 | $ 8,100,000 | $ 8,900,000 |  |
Unrecognized compensation costs | $ |  |  |  |  |  |  |  |  |  | $ 5,900,000 |  | $ 5,900,000 |  |  |  |
Weighted-average period of recognition |  |  |  |  |  |  |  |  |  |  |  | 1 year 1 month 6 days |  |  |  |
Vesting of shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 317,668 |  |  |  |
RSUs | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |
RSUs | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs | $ |  |  |  |  |  |  |  |  |  | 0 |  | $ 0 |  |  |  |
Expiration period |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rate |  |  |  |  |  |  |  |  |  |  |  | 4.10% |  |  |  |
Dividend yield |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |
Expected volatility |  |  |  |  |  |  |  |  |  |  |  | 78.20% |  |  |  |
2025 Executive Performance Share Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value, granted (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 24.10 |  |  |  |
Unrecognized compensation costs | $ |  |  |  |  |  |  |  |  |  | $ 25,900,000 |  | $ 25,900,000 |  |  |  |
Weighted-average period of recognition |  |  |  |  |  |  |  |  |  |  |  | 1 year 6 months 25 days |  |  |  |
Number of stock price hurdles | hurdle |  |  |  |  |  |  |  |  |  | 4 |  | 4 |  |  |  |
Vesting of shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Risk-free interest rate | 3.91% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend yield | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected volatility | 98.88% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2025 Executive Performance Share Units | Share-Based Payment Arrangement, Tranche One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting rights, percentage |  |  |  |  |  |  |  |  |  |  | 33.00% |  |  |  |  |
2025 Executive Performance Share Units | Share-Based Payment Arrangement, Tranche Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting rights, percentage |  |  |  |  |  |  |  |  |  |  | 33.00% |  |  |  |  |
2025 Executive Performance Share Units | Share-Based Payment Arrangement, Tranche Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting rights, percentage |  |  |  |  |  |  |  |  |  |  | 34.00% |  |  |  |  |
2025 Executive Performance Share Units | Stock Price, Hurdle One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock hurdle price (in usd per share) |  |  |  |  |  |  |  |  |  | $ 19.75 |  | $ 19.75 |  |  |  |
2025 Executive Performance Share Units | Stock Price, Hurdle Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock hurdle price (in usd per share) |  |  |  |  |  |  |  |  |  | 26.76 |  | 26.76 |  |  |  |
2025 Executive Performance Share Units | Stock Price, Hurdle Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock hurdle price (in usd per share) |  |  |  |  |  |  |  |  |  | 31.01 |  | 31.01 |  |  |  |
2025 Executive Performance Share Units | Stock Price, Hurdle Four |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock hurdle price (in usd per share) |  |  |  |  |  |  |  |  |  | $ 68.82 |  | 68.82 |  |  |  |
Equity-classified 2024 Executive PSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value, granted (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Unrecognized compensation costs | $ |  |  |  |  |  |  |  |  |  | $ 10,000,000.0 |  | $ 10,000,000.0 |  |  |  |
Weighted-average period of recognition |  |  |  |  |  |  |  |  |  |  |  | 1 year 21 days |  |  |  |
Stock hurdle price (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.14 |
Fair value of instruments vested | $ |  |  |  |  |  |  |  |  |  |  |  | $ 26,700,000 | $ 0 |  |  |
Vesting of shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 848,408 |  |  |  |
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) |  |  | $ 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) |  |  | $ 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) |  |  | 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) |  |  | $ 68.82 | $ 68.82 |  |  |  |  |  |  |  |  |  |  |  |
Liability-classified 2024 Executive PSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value, granted (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Stock hurdle price (in usd per share) |  |  |  |  |  | $ 14.86 |  |  |  |  |  |  |  |  | $ 20.14 |
Vesting of shares (in shares) | shares |  |  |  |  |  | 21,563 |  |  |  |  |  | 21,562 |  |  |  |
Payments of cash settlement | $ |  |  |  |  |  | $ 600,000 |  |  |  |  |  |  |  |  |  |
Fair value of the awards before the modification | $ |  |  |  |  |  |  |  |  |  | 2,200,000 |  | $ 2,200,000 |  |  |  |
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 | $ |  |  |  |  |  |  |  |  |  |  |  | $ 1,900,000 |  |  |  |
PSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value, granted (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Vesting of shares (in shares) | 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) | shares |  | 954,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs | $ |  | $ 9,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration period |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense | $ |  |  |  |  |  |  |  |  |  | $ (800,000) |  |  |  |  |  |
Major Rocket Incentive Shares | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment award, financial performance benchmarks | $ |  | $ 10,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major Rocket Incentive Shares | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment award, financial performance benchmarks | $ |  | $ 25,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2011 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment award, shares authorized (in shares) | shares |  |  |  |  |  |  |  |  |  | 20,775,000 |  | 20,775,000 |  |  |  | 13,775,000
Maximum number of shares issuable (in shares) | shares |  |  |  |  |  |  |  |  | 7,000,000 |  |  |  |  |  |  |
Number of shares available for issuance (in shares) | shares |  |  |  |  |  |  |  |  |  | 4,709,744 |  | 4,709,744 |  |  |  |

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