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SUBSEQUENT EVENTS (Details)
Mar. 28, 2017
shares
Jan. 31, 2017
shares
Jan. 31, 2016
shares
SUBSEQUENT EVENTS      
Common stock, shares authorized   90,000,000 90,000,000
Subsequent event      
SUBSEQUENT EVENTS      
Common stock, shares authorized 450,000,000    
Minimum | Subsequent event      
SUBSEQUENT EVENTS      
Conversion stock split ratio 0.50    
Maximum | Subsequent event      
SUBSEQUENT EVENTS      
Conversion stock split ratio 0.04    
2016 Equity Incentive Plan | Subsequent event      
SUBSEQUENT EVENTS      
Additional shares authorized 20,000,000