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STOCKHOLDERS' EQUITY (DEFICIT) AND COMPENSATION ARRANGEMENTS - Narrative (Details) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
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Mar. 31, 2025 USD ($) shares | Mar. 11, 2025 USD ($) shares | Dec. 31, 2024 | Oct. 14, 2024 hurdle $ / shares | Jun. 12, 2024 hurdle $ / shares | Jan. 22, 2024 USD ($) $ / shares shares | Mar. 30, 2023 $ / shares shares | Oct. 31, 2024 USD ($) | Feb. 29, 2024 USD ($) | Mar. 31, 2025 USD ($) shares | Dec. 31, 2024 shares | May 02, 2025 $ / shares shares | Nov. 30, 2023 USD ($)
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
Subscription price (in usd per share) | $ / shares |  |  |  |  |  | $ 11.30 |  |  |  |  |  |  |
Shares issued in transaction (in shares) |  |  |  |  |  | 7,079,646 |  |  |  |  |  |  |
Rights offering amount | $ |  |  |  |  |  | $ 80.0 |  |  | $ 80.0 |  |  |  |
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 |  |  |  |  |  |  |
Backstop Party | Rights Offering |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Other Stockholders | Rights Offering |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, subscriptions amount (in shares) |  |  |  |  |  | 9,700,000 |  |  |  |  |  |  |
RSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs | $ | $ 4.6 |  |  |  |  |  |  |  |  | $ 4.6 |  |  |
Weighted-average period of recognition (in years) |  |  |  |  |  |  |  |  |  | 1 year 1 month 17 days |  |  |
Vesting of RSUs and PSUs (in shares) |  |  |  |  |  |  |  |  |  | 19,805 |  |  |
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% |  |  |
PSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting of RSUs and PSUs (in shares) |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Equity-classified 2024 Executive PSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs | $ | 21.1 |  |  |  |  |  |  |  |  | $ 21.1 |  |  |
Weighted-average period of recognition (in years) |  |  |  |  |  |  |  |  |  | 1 year 6 months 10 days |  |  |
Number of stock price hurdles | hurdle |  |  |  | 4 | 4 |  |  |  |  |  |  |  |
Risk-free interest rate |  |  |  | 3.86% | 4.46% |  |  |  |  |  |  |  |
Dividend yield |  |  |  | 0.00% | 0.00% |  |  |  |  |  |  |  |
Expected volatility |  |  |  | 98.70% | 95.73% |  |  |  |  |  |  |  |
Requisite service period (in years) |  |  |  | 2 years 6 months 14 days | 2 years 10 months 17 days |  |  |  |  |  |  |  |
Equity-classified 2024 Executive PSUs | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock hurdle price (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 14.86 |
Number of PSUs eligible to vest (in shares) |  |  |  |  |  |  |  |  |  |  |  | 295,022 |
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] |  |  |  |  |  |  |  |  |  |  |  |  |
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 2024 Executive PSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs | $ | $ 2.2 |  |  |  |  |  |  |  |  | $ 2.2 |  |  |
Weighted-average period of recognition (in years) |  |  |  |  |  |  |  |  |  | 1 year 6 months |  |  |
Vesting of RSUs and PSUs (in shares) |  |  |  |  |  |  |  |  |  | 0 |  |  |
Cash awards limit per annum | $ |  |  |  |  |  |  |  | $ 5.0 |  |  |  |  |
Risk-free interest rate | 3.85% |  | 4.21% |  |  |  |  | 3.86% |  |  |  |  |
Dividend yield | 0.00% |  | 0.00% |  |  |  |  | 0.00% |  |  |  |  |
Expected volatility | 102.08% |  | 100.27% |  |  |  |  | 98.70% |  |  |  |  |
Requisite service period (in years) | 2 years 29 days |  |  |  |  |  |  |  |  |  |  |  |
Liability-classified 2024 Executive PSUs | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock hurdle price (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 14.86 |
Number of PSUs eligible to vest (in shares) |  |  |  |  |  |  |  |  |  |  |  | 21,562 |
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 |  |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  |  |  |  |  | 4 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) | 6,005,860 |  |  |  |  |  |  |  |  | 6,005,860 |  |  |

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