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LONG-TERM DEBT - Estimated fair value of warrants (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 22, 2019
Mar. 01, 2019
Mar. 31, 2017
Common share price on date of issuance   $ 9.20 $ 5.87 $ 9.75
Warrant [Member] | Measurement Input, Exercise Price [Member]        
Exercise Price $ 4.08      
Warrant [Member] | Measurement Input, Share Price [Member]        
Common share price on date of issuance $ 6.80      
Warrant [Member] | Measurement Input, Price Volatility [Member]        
Volatility 195.90%      
Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member]        
Risk-free interest rate 2.63%      
Warrant [Member] | Measurement Input, Expected Term [Member]        
Warrants, contractual term 7 years