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CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY - Range of Exercise Price (Details) - USD ($)
3 Months Ended 9 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2018
Oct. 31, 2017
Options Outstanding        
Number Outstanding (in shares) 31,122,646   31,122,646  
Weighted Average Remaining Contractual Life     7 years 9 months 11 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.38   $ 0.38  
Options Exercisable        
Number Vested and Exercisable (in shares) 12,637,057   12,637,057  
Weighted Average Exercise Prices (in dollars per share) $ 0.55   $ 0.55  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures        
Total intrinsic value of options exercised $ 24,000   $ 26,000 $ 4,000
Exercised   0    
$0.10 - $0.16        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range        
Exercise prices, low end of range (in dollars per share)     $ 0.10  
Exercise prices, high end of range (in dollars per share)     $ 0.16  
Options Outstanding        
Number Outstanding (in shares) 8,249,863   8,249,863  
Weighted Average Remaining Contractual Life     7 years 8 months 9 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.11   $ 0.11  
Options Exercisable        
Number Vested and Exercisable (in shares) 3,541,540   3,541,540  
Weighted Average Exercise Prices (in dollars per share) $ 0.10   $ 0.10  
$0.17 - $0.35        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range        
Exercise prices, low end of range (in dollars per share)     0.17  
Exercise prices, high end of range (in dollars per share)     $ 0.35  
Options Outstanding        
Number Outstanding (in shares) 12,965,729   12,965,729  
Weighted Average Remaining Contractual Life     9 years  
Weighted Average Exercise Prices (in dollars per share) $ 0.22   $ 0.22  
Options Exercisable        
Number Vested and Exercisable (in shares) 2,214,574   2,214,574  
Weighted Average Exercise Prices (in dollars per share) $ 0.23   $ 0.23  
$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) 3,810,189   3,810,189  
Weighted Average Remaining Contractual Life     5 years 11 months 16 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.53   $ 0.53  
Options Exercisable        
Number Vested and Exercisable (in shares) 2,737,123   2,737,123  
Weighted Average Exercise Prices (in dollars per share) $ 0.54   $ 0.54  
$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) 4,595,720   4,595,720  
Weighted Average Remaining Contractual Life     6 years 8 months 16 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.77   $ 0.77  
Options Exercisable        
Number Vested and Exercisable (in shares) 2,800,095   2,800,095  
Weighted Average Exercise Prices (in dollars per share) $ 0.78   $ 0.78  
$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) 1,401,145   1,401,145  
Weighted Average Remaining Contractual Life     5 years 5 months 19 days  
Weighted Average Exercise Prices (in dollars per share) $ 1.68   $ 1.68  
Options Exercisable        
Number Vested and Exercisable (in shares) 1,243,725   1,243,725  
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     6 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