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CONVERTIBLE REDEEMABLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY - Stock Option Activities (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Weighted Average Exercise Prices      
Granted $ 0.21 $ 0.40  
Plans      
Available for Grant      
Available for grant, beginning 252,379 350,875  
Shares authorized for issuance 20,000,000 4,000,000  
Granted (18,553,000) (4,664,054)  
Available for grant, ending 1,884,878 252,379 350,875
Shares      
Outstanding, Beginning 6,465,829 2,704,608  
Granted 18,553,000 4,664,054  
Exercised (40,000) (131,000)  
Outstanding, Ending 24,724,663 6,465,829 2,704,608
Vested and exercisable 4,824,931    
Vested and expected to vest 22,248,572    
Weighted Average Exercise Prices      
Outstanding, Beginning $ 0.77 $ 1.59  
Granted 0.29 0.55  
Exercised 0.25 0.31  
Outstanding, Ending $ 0.41 $ 0.77 $ 1.59
Granted 18,553,000 4,664,054  
Vested and exercisable $ 0.78    
Vested and expected to vest $ 0.42    
Remaining Contractual Life      
Outstanding 9 years 2 months 1 day 8 years 9 months 7 days 8 years 4 months 13 days
Vested and exercisable 7 years 5 months 19 days    
Vested and expected to vest 9 years 1 month 13 days    
Aggregate Intrinsic Value      
Outstanding $ 304 $ 238 $ 1,343
Vested and exercisable 9    
Vested and expected to vest $ 266    
2014 Equity Incentive Plan      
Available for Grant      
Cancelled   587,249  
Expired upon termination of the 2014 Plan   (21,691)  
Shares      
Cancelled   (587,249)  
Weighted Average Exercise Prices      
Cancelled   $ 1.76  
Subsequent to termination of the 2014 plan      
Available for Grant      
Cancelled 68,667 184,584  
Shares      
Cancelled (68,667) (184,584)  
Weighted Average Exercise Prices      
Cancelled $ 1.48 $ 1.92  
2016 Equity Incentive Plan      
Available for Grant      
Cancelled 185,499    
Shares      
Cancelled (185,499)    
Weighted Average Exercise Prices      
Cancelled $ 0.65    
Outside the 2014 Equity Incentive Plan      
Shares      
Outstanding, Beginning 660,000    
Outstanding, Ending 660,000 660,000  
Vested and exercisable 368,541    
Vested and expected to vest 634,825    
Weighted Average Exercise Prices      
Outstanding, Beginning $ 1.44    
Outstanding, Ending 1.44 $ 1.44  
Vested and exercisable 1.44    
Vested and expected to vest $ 1.44    
Remaining Contractual Life      
Outstanding 7 years 8 months 19 days 7 years 8 months 19 days  
Vested and exercisable 7 years 8 months 12 days    
Vested and expected to vest 7 years 8 months 19 days    
Outside the 2014 Equity Incentive Plan | First anniversary      
Available for Grant      
Vesting percentage 25.00%    
Outside the 2014 Equity Incentive Plan | Subsequent to first anniversary      
Available for Grant      
Vesting percentage 2.083%