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NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES - Warrant Liabilities, Segments, Mezzanine Equity and Loss per Share (Details)
12 Months Ended
Apr. 01, 2021
Dec. 31, 2021
segment
shares
Dec. 31, 2020
shares
Oct. 22, 2021
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Conversion ratio       1
Number of operating segments | segment   2    
Antidilutive securities excluded from computation of earnings per share (in shares) | shares   28,209,600 0  
Stronghold LLC | Q Power LLC        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Ownership interest 69.00% 56.10%