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FAIR VALUE (Narratives) (Details)
 1 Months Ended
Jan. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Y
shares
Dec. 31, 2020
Y
2016 Warrant Liability [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Warrants outstanding (in shares) | shares   357  
Settlement of warrant liability | $ $ 100,000    
Warrants and rights outstanding | $   $ 0  
Measurement Input, Price Volatility [Member] | 2016 Warrant Liability [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Warrants and Rights Outstanding, Measurement Input     135
Measurement Input, Risk Free Interest Rate [Member] | 2016 Warrant Liability [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Warrants and Rights Outstanding, Measurement Input     0.08
Minimum | Measurement Input, Price Volatility [Member] | Bridge Note Warrant Liabilities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Warrants and Rights Outstanding, Measurement Input   169 162
Minimum | Measurement Input, Risk Free Interest Rate [Member] | Bridge Note Warrant Liabilities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Warrants and Rights Outstanding, Measurement Input   0.05 0.10
Minimum | Measurement Input, Expected Term [Member] | Bridge Note Warrant Liabilities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Warrants and Rights Outstanding, Measurement Input | Y   0.6 1.3
Maximum | Measurement Input, Price Volatility [Member] | Bridge Note Warrant Liabilities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Warrants and Rights Outstanding, Measurement Input   206 201
Maximum | Measurement Input, Risk Free Interest Rate [Member] | Bridge Note Warrant Liabilities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Warrants and Rights Outstanding, Measurement Input   0.41 0.17
Maximum | Measurement Input, Expected Term [Member] | Bridge Note Warrant Liabilities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Warrants and Rights Outstanding, Measurement Input | Y   2.6 3.4