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CONVERTIBLE REDEEMABLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY - Stock Option Activities (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Apr. 30, 2017
Jan. 31, 2017
Shares    
Exercised 0  
Weighted Average Exercise Prices    
Weighted-average grant date fair value (in dollars per share) $ 0.56  
Plans    
Available for Grant    
Available for grant, beginning 252,379  
Shares authorized for issuance 20,000,000  
Granted (5,095,000)  
Available for grant, ending 15,157,379 252,379
Shares    
Outstanding, Beginning 6,465,829  
Granted 5,095,000  
Outstanding, Ending 11,560,829 6,465,829
Vested and exercisable 2,495,905  
Vested and expected to vest 10,208,093  
Weighted Average Exercise Prices    
Outstanding, Beginning $ 0.77  
Exercised 0.73  
Outstanding, Ending $ 0.75 $ 0.77
Granted 5,095,000  
Vested and exercisable $ 0.98  
Vested and expected to vest $ 0.76  
Remaining Contractual Life    
Outstanding 9 years 1 month 28 days 8 years 9 months 7 days
Vested and exercisable 7 years 4 months 21 days  
Vested and expected to vest 9 years 1 month 2 days  
Aggregate Intrinsic Value    
Outstanding $ 2,062 $ 238
Vested and exercisable 487  
Vested and expected to vest $ 1,839  
Outside of the 2016 Equity Incentive Plan    
Shares    
Outstanding, Beginning 660,000  
Outstanding, Ending 660,000 660,000
Vested and exercisable 244,791 244,791
Vested and expected to vest 610,721 610,721
Weighted Average Exercise Prices    
Outstanding, Beginning $ 1.44  
Outstanding, Ending 1.44 $ 1.44
Vested and exercisable 1.44 1.44
Vested and expected to vest $ 1.44 $ 1.44
Remaining Contractual Life    
Outstanding 8 years 5 months 19 days 8 years 5 months 19 days
Vested and exercisable 8 years 5 months 12 days 8 years 5 months 12 days
Vested and expected to vest 8 years 5 months 19 days 8 years 5 months 19 days
Outside of the 2016 Equity Incentive Plan | First anniversary    
Available for Grant    
Vesting percentage 25.00%  
Outside of the 2016 Equity Incentive Plan | Subsequent to first anniversary    
Available for Grant    
Vesting percentage 2.083%