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EQUITY-BASED COMPENSATION - Narrative (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 11, 2021 shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) shares | Mar. 17, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock options granted (in shares) |  | 0 | 613,000 |  |
Weighted average grant-date fair value (in usd per share) | $ / shares |  |  | $ 11.41 |  |
Stock options exercised (in shares) |  | 0 | 0 |  |
Michael Dee | Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock options granted (in shares) | 613,000 |  |  |  |
Vesting period | 3 years |  |  |  |
Michael Dee | PSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Awards subject to continuing vesting (in shares) | 200,000 |  |  |  |
RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expected annual dividend yield |  | 0.00% | 0.00% |  |
Equity-based compensation cost | $ |  | $ 11.2 | $ 16.6 | $ 5.6 |
Awards outstanding (in shares) |  | 2,760,000 | 2,671,000 | 762,000 |
RSUs | Michael Dee | RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Awards subject to continuing vesting (in shares) | 667,000 |  |  |  |
RSUs | Michael Dee | RSUs | Vest on March 17, 2022 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage | 0.50 |  |  |  |
RSUs | Michael Dee | RSUs | Vest Upon Commissioning of Commercial Plant |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage | 0.50 |  |  |  |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expected annual dividend yield | 0.00% | 0.00% | 0.00% |  |
Equity-based compensation cost | $ |  | $ (0.2) | $ 1.6 | $ 0.0 |
PSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expected annual dividend yield |  | 0.00% | 0.00% |  |
Equity-based compensation cost | $ |  | $ (0.2) | $ 4.4 | $ 0.0 |
Awards outstanding (in shares) |  | 1,060,000 | 424,000 | 0 |
2020 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for issuance, percentage of outstanding common stock |  |  |  |  | 3.00%
Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares authorized of issuance (in shares) |  | 12,100,000 |  |  |
Shares available for issuance (in shares) |  | 6,400,000 |  |  |

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