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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, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Options Outstanding        
Number Outstanding (in shares) 25,152,297   25,152,297  
Weighted Average Remaining Contractual Life     8 years 7 months 21 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.44   $ 0.44  
Options Exercisable        
Number Vested and Exercisable (in shares) 9,715,584   9,715,584  
Weighted Average Exercise Prices (in dollars per share) $ 0.63   $ 0.63  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures        
Total intrinsic value of options exercised $ 1,000 $ 4,000 $ 2,000 $ 4,000
$0.10 - $0.19        
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)     $ 0.19  
Options Outstanding        
Number Outstanding (in shares) 10,286,112   10,286,112  
Weighted Average Remaining Contractual Life     9 years 4 months 28 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.11   $ 0.11  
Options Exercisable        
Number Vested and Exercisable (in shares) 2,218,760   2,218,760  
Weighted Average Exercise Prices (in dollars per share) $ 0.10   $ 0.10  
$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) 3,823,609   3,823,609  
Weighted Average Remaining Contractual Life     8 years 8 months 19 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.22   $ 0.22  
Options Exercisable        
Number Vested and Exercisable (in shares) 1,369,830   1,369,830  
Weighted Average Exercise Prices (in dollars per share) $ 0.25   $ 0.25  
$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) 4,171,855   4,171,855  
Weighted Average Remaining Contractual Life     7 years 11 months 23 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.53   $ 0.53  
Options Exercisable        
Number Vested and Exercisable (in shares) 2,464,009   2,464,009  
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) 5,296,971   5,296,971  
Weighted Average Remaining Contractual Life     8 years 3 months 4 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.76   $ 0.76  
Options Exercisable        
Number Vested and Exercisable (in shares) 2,366,654   2,366,654  
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) 1,473,750   1,473,750  
Weighted Average Remaining Contractual Life     6 years 6 months 11 days  
Weighted Average Exercise Prices (in dollars per share) $ 1.67   $ 1.67  
Options Exercisable        
Number Vested and Exercisable (in shares) 1,196,331   1,196,331  
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 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