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NET LOSS PER SHARE - Summary of Outstanding Common Stock Equivalents (Details) - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Total anti-dilutive shares (in shares) |  | 52,003 | 58,290 | 49,662
Warrants |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Total anti-dilutive shares (in shares) |  | 5,715 | 33,352 | 23,776
Stock Options |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Total anti-dilutive shares (in shares) |  | 1,487 | 1,290 | 983
RSUs |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Total anti-dilutive shares (in shares) |  | 2,929 | 3,438 | 2,788
PSUs |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Total anti-dilutive shares (in shares) |  | 797 | 1,341 | 1,246
Contingently - issuable shares to Legacy PCT unitholders |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Total anti-dilutive shares (in shares) | [1] | 2,000 | 2,000 | 4,000
Shares issuable upon conversion of Green Convertible Notes |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Total anti-dilutive shares (in shares) |  | 16,869 | 16,869 | 16,869
Shares issuable upon conversion of Series B Convertible Perpetual Preferred Stock |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Total anti-dilutive shares (in shares) |  | 22,206 | 0 | 0
[1] | In connection with the initial business combination and merger agreement as described in Note 1 - Organization, legacy PCT unitholders will be entitled to 2.0 million shares upon the Ironton Facility becoming operational, as certified by Leidos Engineering, LLC, an independent engineering firm, in accordance with criteria established in agreements in connection with construction of the plant.

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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