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CONVERTIBLE REDEEMABLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY - Range of Exercise Price (Details) - USD ($)
3 Months Ended 9 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2017
Oct. 31, 2016
Options Outstanding        
Number Outstanding (in shares) 12,097,912   12,097,912  
Weighted Average Remaining Contractual Life     8 years 7 months 21 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.79   $ 0.79  
Options Exercisable        
Number Vested and Exercisable (in shares) 4,013,604   4,013,604  
Weighted Average Exercise Prices (in dollars per share) $ 0.93   $ 0.93  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures        
Total intrinsic value of options exercised $ 0 $ 26,000 $ 4,000 $ 65,000
$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) 611,441   611,441  
Weighted Average Remaining Contractual Life     5 years 11 months 12 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.31   $ 0.31  
Options Exercisable        
Number Vested and Exercisable (in shares) 573,941   573,941  
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) 4,273,667   4,273,667  
Weighted Average Remaining Contractual Life     8 years 10 months 13 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.53   $ 0.53  
Options Exercisable        
Number Vested and Exercisable (in shares) 1,498,948   1,498,948  
Weighted Average Exercise Prices (in dollars per share) $ 0.58   $ 0.58  
$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) 5,622,804   5,622,804  
Weighted Average Remaining Contractual Life     9 years 1 month 13 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.76   $ 0.76  
Options Exercisable        
Number Vested and Exercisable (in shares) 855,095   855,095  
Weighted Average Exercise Prices (in dollars per share) $ 0.84   $ 0.84  
$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 4 months 10 days  
Weighted Average Exercise Prices (in dollars per share) $ 1.67   $ 1.67  
Options Exercisable        
Number Vested and Exercisable (in shares) 985,620   985,620  
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 6 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