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STOCK-BASED COMPENSATION - Weighted-average fair value (Details)
6 Months Ended
Mar. 31, 2020
STOCK-BASED COMPENSATION  
Risk-free interest rate 1.61%
Dividend yield 0.00%
Expected life of the options (years) 8 years
Minimum  
STOCK-BASED COMPENSATION  
Volatility of the expected market price of the Company's common shares 70.80%
Maximum  
STOCK-BASED COMPENSATION  
Volatility of the expected market price of the Company's common shares 71.50%