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STOCKHOLDERS' EQUITY - Schedule of Employee and Consulting Awards Activity (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Class of Warrant or Right [Line Items]      
Granted 1,158,000    
Employee Awards [Member]      
Class of Warrant or Right [Line Items]      
Outstanding, Number of Shares 4,903,545 7,266,420  
Outstanding, Weighted-Average Exercise Price per Share $ 1.11 $ 1.03  
Outstanding, Weighted-Average Remaining Contractual Term 5 years 3 months 18 days    
Outstanding, Aggregate Intrinsic Value $ 22,000    
Granted 1,158,000    
Granted $ 0.82    
Exercised, Number of Shares (394,670)    
Exercised, Weighted-Average Exercise Price per Share $ 0.52    
Forfeited or expired (3,126,205)    
Forfeited or expired, Weighted-Average Exercise Price per Share $ 1.04    
Exercisable, Number of Shares 3,893,665    
Exercisable, Weighted-Average Exercise Price per Share $ 1.21    
Exercisable, Weighted-Average Remaining Contractual Term 5 years 7 months 6 days 5 years 6 months  
Exercisable, Aggregate Intrinsic Value $ 4,000 $ 167,000  
Consulting Awards [Member]      
Class of Warrant or Right [Line Items]      
Outstanding, Number of Shares   100,000  
Outstanding, Weighted-Average Exercise Price per Share   $ 1.22  
Forfeited or expired (40,000)    
Forfeited or expired, Weighted-Average Exercise Price per Share $ 0.61    
Outstanding and exercisable, Number of Shares 60,000    
Outstanding and exercisable, Weighted-Average Exercise Price per Share $ 1.55    
Outstanding and exercisable, Weighted-Average Remaining Contractual Term 2 years 3 months 18 days    
Exercisable, Weighted-Average Remaining Contractual Term   2 years 3 months 18 days  
Warrants with Debt [Member]      
Class of Warrant or Right [Line Items]      
Outstanding, Number of Shares   7,421,011 8,473,214
Outstanding, Weighted-Average Exercise Price per Share   $ 0.46 $ 0.64
Outstanding, Weighted-Average Remaining Contractual Term   2 years  
Outstanding, Aggregate Intrinsic Value   $ 478,925  
Granted 1,868,518 7,143,011  
Granted $ 0.56 $ 0.42  
Exercised, Number of Shares   (1,131,000)  
Exercised, Weighted-Average Exercise Price per Share   $ 0.40  
Forfeited or expired (1,204,000) (7,064,214)  
Forfeited or expired, Weighted-Average Exercise Price per Share $ 0.65 $ 0.63  
Outstanding and exercisable, Number of Shares 8,085,529    
Outstanding and exercisable, Weighted-Average Exercise Price per Share $ 0.58    
Outstanding and exercisable, Weighted-Average Remaining Contractual Term 2 years 9 months 18 days