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CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY - Stock Option Activities (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2018
Mar. 31, 2017
Oct. 31, 2018
Jul. 31, 2018
Apr. 30, 2018
Oct. 31, 2017
Jul. 31, 2018
Oct. 31, 2018
Jan. 31, 2018
Shares                  
Exercised           0      
Plans                  
Available for Grant                  
Available for grant, beginning 2,378,610   2,378,610 2,261,847 1,884,878   1,884,878 1,884,878  
Shares authorized for issuance     50,000,000            
Granted     (10,444,000)            
Available for grant, ending     46,018,197 2,378,610 2,261,847   2,378,610 46,018,197 1,884,878
Shares                  
Outstanding, Beginning 24,092,297   24,092,297 24,263,804 24,724,663   24,724,663 24,724,663  
Granted     10,444,000            
Exercised     (262,500) (5,556) (10,140)        
Outstanding, Ending     30,116,501 24,092,297 24,263,804   24,092,297 30,116,501 24,724,663
Vested and exercisable     12,149,662         12,149,662  
Vested and expected to vest     28,583,682         28,583,682  
Weighted Average Exercise Prices                  
Outstanding, Beginning $ 0.41   $ 0.41 $ 0.41 $ 0.41   $ 0.41 $ 0.41  
Granted     0.21            
Exercised     0.10 0.10 0.13        
Outstanding, Ending     $ 0.36 $ 0.41 $ 0.41   $ 0.41 0.36 $ 0.41
Granted     10,444,000            
Vested and exercisable     $ 0.51         0.51  
Vested and expected to vest     $ 0.37         $ 0.37  
Remaining Contractual Life                  
Outstanding     7 years 9 months 22 days 8 years 8 months 1 day 8 years 10 months 28 days       9 years 2 months 1 day
Vested and exercisable     5 years 6 months            
Vested and expected to vest     7 years 8 months 19 days            
Aggregate Intrinsic Value                  
Outstanding     $ 507 $ 982 $ 1,300   $ 982 $ 507 $ 304
Vested and exercisable     234         234  
Vested and expected to vest     $ 490         $ 490  
2014 Equity Incentive Plan                  
Available for Grant                  
Cancelled     73,709 49,188 73,750        
Shares                  
Cancelled     (73,709) (49,188) (73,750)        
Weighted Average Exercise Prices                  
Cancelled     $ 0.91 $ 0.95 $ 0.73        
2016 Equity Incentive Plan                  
Available for Grant                  
Shares authorized for issuance 50,000,000 20,000,000              
Cancelled     4,083,587 116,763 376,969        
Shares                  
Cancelled     (4,083,587) (116,763) (376,969)        
Weighted Average Exercise Prices                  
Cancelled     $ 0.26 $ 0.35 $ 0.35        
Outside of the 2016 Equity Incentive Plan                  
Available for Grant                  
Granted             (400,000)    
Cancelled     53,855            
Shares                  
Outstanding, Beginning 1,060,000   1,060,000   660,000   660,000 660,000  
Granted             400,000    
Cancelled     (53,855)            
Outstanding, Ending     1,006,145 1,060,000     1,060,000 1,006,145 660,000
Vested and exercisable     487,395         487,395  
Vested and expected to vest     970,103         970,103  
Weighted Average Exercise Prices                  
Outstanding, Beginning $ 0.97   $ 0.97   $ 1.44   $ 1.44 $ 1.44  
Granted             0.19    
Cancelled     1.67            
Outstanding, Ending     0.93 $ 0.97     $ 0.97 0.93 $ 1.44
Granted             400,000    
Vested and exercisable     1.44         1.44  
Vested and expected to vest     $ 0.95         $ 0.95  
Remaining Contractual Life                  
Outstanding     6 years 8 months 1 day       8 years 1 month 2 days   7 years 8 months 19 days
Vested and exercisable               4 years 5 months 12 days  
Vested and expected to vest               6 years 7 months 2 days  
Aggregate Intrinsic Value                  
Outstanding       $ 4     $ 4    
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%