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STOCKHOLDERS? EQUITY - Stock Option Activities (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2018
Mar. 31, 2017
Oct. 31, 2019
Jul. 31, 2019
Apr. 30, 2019
Oct. 31, 2019
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Weighted Average Exercise Prices                  
Granted             $ 0.12 $ 0.21  
The Plans                  
Available for Grant                  
Available for grant, beginning     1,507,589 2,160,035 2,107,575 2,107,575 1,884,878 252,379  
Shares authorized for issuance             50,000,000 20,000,000  
Granted       (877,100) (16,720)   (10,444,000) (18,553,000)  
Available for grant, ending     1,612,728 1,507,589 2,160,035 1,612,728 2,107,575 1,884,878 252,379
Shares                  
Outstanding, Beginning     1,481,444 835,338 917,945 917,945 24,724,663 6,465,829  
Granted       877,100 16,720   10,444,000 18,553,000  
Exercised       0 (1,667)   (278,196) (40,000)  
Outstanding, Ending     1,364,827 1,481,444 835,338 1,364,827 917,945 24,724,663 6,465,829
Vested and exercisable     421,764     421,764 9,257,545    
Vested and expected to vest     1,137,123     1,137,123 21,836,056    
Weighted Average Exercise Prices                  
Outstanding, Beginning     $ 4.44 $ 8.27 $ 9.02 $ 9.02 $ 0.41 $ 0.77  
Granted       0.80 3.21   0.21 0.29  
Exercised         2.50   0.10 0.25  
Outstanding, Ending     3.93 $ 4.44 $ 8.27 3.93 9.02 $ 0.41 $ 0.77
Vested and exercisable     7.56     7.56 0.53    
Vested and expected to vest     $ 4.26     $ 4.26 $ 0.37    
Remaining Contractual Life                  
Outstanding     8 years 11 months 12 days 8 years 7 months 13 days 8 years 4 months 6 days   7 years 11 months 1 day 9 years 2 months 1 day 8 years 9 months 7 days
Vested and exercisable     8 years 18 days       5 years 11 months 5 days    
Vested and expected to vest     8 years 10 months 13 days       7 years 10 months 6 days    
Aggregate Intrinsic Value                  
Outstanding             $ 23 $ 304 $ 238
2014 Equity Incentive Plan                  
Available for Grant                  
Canceled     11,478 6,340 28,480        
Shares                  
Canceled     (11,478) (6,340) (28,480)        
Weighted Average Exercise Prices                  
Canceled     $ 28.13 $ 13.06 $ 28.27        
2016 Equity Incentive Plan                  
Available for Grant                  
Shares authorized for issuance 2,000,000 800,000              
Canceled     105,139 224,654 69,180   11,262,538 185,499  
Shares                  
Canceled     (105,139) (224,654) (69,180)   (11,262,538) (185,499)  
Weighted Average Exercise Prices                  
Canceled     $ 8.54 $ 4.18 $ 8.84   $ 0.30 $ 0.65  
Outside of the 2016 Equity Incentive Plan                  
Available for Grant                  
Canceled     8,250 750 6,000        
Shares                  
Outstanding, Beginning     24,250 25,000 31,000 31,000      
Canceled     (8,250) (750) (6,000)        
Outstanding, Ending     16,000 24,250 25,000 16,000 31,000    
Vested and exercisable     6,667     6,667      
Vested and expected to vest     13,819     13,819      
Weighted Average Exercise Prices                  
Outstanding, Beginning     $ 12.40 $ 12.85 $ 17.86 $ 17.86      
Canceled     27.25 27.25 38.75        
Outstanding, Ending     4.75 $ 12.40 $ 12.85 4.75 $ 17.86    
Vested and exercisable     4.75     4.75      
Vested and expected to vest     $ 4.75     $ 4.75      
Remaining Contractual Life                  
Outstanding     8 years 3 months 4 days 5 years 8 months 9 days 7 years 11 months 1 day   6 years 7 months 6 days    
Vested and exercisable           8 years 3 months 4 days      
Vested and expected to vest           8 years 3 months 4 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%