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WARRANTS - RTI Warrant Activity (Details) - $ / shares
 12 Months Ended
Mar. 17, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Weighted average remaining contractual term (years)        
Weighted average remaining contractual term (years) 5 years      
RTI warrants        
Number of warrants        
Beginning balance, Number of warrants (in shares)   971,000 971,000  
Granted, Number of warrants (in shares)   0 0  
Exercised, Number of warrants (in shares)   0 0  
Ending balance, Number of warrants (in shares)   971,000 971,000 971,000
Exercisable, Number of warrants (in shares)   971,000    
Weighted average exercise price        
Beginning balance, Weighted average exercise price (in usd per share)   $ 5.56 $ 5.56  
Ending balance, Weighted average exercise price (in usd per share)   5.56 5.56 $ 5.56
Weighted average grant date fair value        
Beginning balance, Weighted average grant date fair value (in usd per share)   0.03 0.03  
Ending balance, Weighted average grant date fair value (in usd per share)   $ 0.03 $ 0.03 $ 0.03
Weighted average remaining contractual term (years)        
Weighted average remaining contractual term (years)   2 years 3 years 4 years