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CONVERTIBLE REDEEMABLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY - Range of Exercise Price (Details) - USD ($)
3 Months Ended 6 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2017
Jul. 31, 2016
Options Outstanding        
Number Outstanding (in shares) 12,140,829   12,140,829  
Weighted Average Remaining Contractual Life     8 years 10 months 21 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.79   $ 0.79  
Options Exercisable        
Number Vested and Exercisable (in shares) 3,559,218   3,559,218  
Weighted Average Exercise Prices (in dollars per share) $ 0.95   $ 0.95  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures        
Total intrinsic value of options exercised $ 4,000 $ 5,000 $ 4,000 $ 39,000
$0.20 - $0.35        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range        
Exercise prices, low end of range (in dollars per share)     $ 0.20  
Exercise prices, high end of range (in dollars per share)     $ 0.35  
Options Outstanding        
Number Outstanding (in shares) 618,108   618,108  
Weighted Average Remaining Contractual Life     6 years 2 months 12 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.31   $ 0.31  
Options Exercisable        
Number Vested and Exercisable (in shares) 555,606   555,606  
Weighted Average Exercise Prices (in dollars per share) $ 0.32   $ 0.32  
$0.36 - $0.65        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range        
Exercise prices, low end of range (in dollars per share)     0.36  
Exercise prices, high end of range (in dollars per share)     $ 0.65  
Options Outstanding        
Number Outstanding (in shares) 4,283,667   4,283,667  
Weighted Average Remaining Contractual Life     9 years 1 month 17 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.53   $ 0.53  
Options Exercisable        
Number Vested and Exercisable (in shares) 1,313,834   1,313,834  
Weighted Average Exercise Prices (in dollars per share) $ 0.59   $ 0.59  
$0.66 - $1.09        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range        
Exercise prices, low end of range (in dollars per share)     0.66  
Exercise prices, high end of range (in dollars per share)     $ 1.09  
Options Outstanding        
Number Outstanding (in shares) 5,649,054   5,649,054  
Weighted Average Remaining Contractual Life     9 years 4 months 13 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.76   $ 0.76  
Options Exercisable        
Number Vested and Exercisable (in shares) 680,094   680,094  
Weighted Average Exercise Prices (in dollars per share) $ 0.86   $ 0.86  
$1.10 - $1.85        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range        
Exercise prices, low end of range (in dollars per share)     1.10  
Exercise prices, high end of range (in dollars per share)     $ 1.85  
Options Outstanding        
Number Outstanding (in shares) 1,490,000   1,490,000  
Weighted Average Remaining Contractual Life     7 years 7 months 10 days  
Weighted Average Exercise Prices (in dollars per share) $ 1.67   $ 1.67  
Options Exercisable        
Number Vested and Exercisable (in shares) 909,684   909,684  
Weighted Average Exercise Prices (in dollars per share) $ 1.69   $ 1.69  
$1.86 - $3.00        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range        
Exercise prices, low end of range (in dollars per share)     1.86  
Exercise prices, high end of range (in dollars per share)     $ 3.00  
Options Outstanding        
Number Outstanding (in shares) 100,000   100,000  
Weighted Average Remaining Contractual Life     7 years 9 months  
Weighted Average Exercise Prices (in dollars per share) $ 3.00   $ 3.00  
Options Exercisable        
Number Vested and Exercisable (in shares) 100,000   100,000  
Weighted Average Exercise Prices (in dollars per share) $ 3.00   $ 3.00