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STOCKHOLDERS' EQUITY - Share Purchase Warrants (Details) - $ / shares
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
STOCKHOLDERS' EQUITY    
Number of Warrants, Beginning balance 19,830,000  
Number of Warrants, Ending balance 19,830,000 19,830,000
Weighted Average Exercise Price, Beginning Balance $ 4.42  
Weighted Average Exercise Price, Ending Balance $ 4.42 $ 4.42
Weighted Average Remaining Contractual Life (in years) 1 year 5 months 15 days 1 year 8 months 12 days