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CONVERTIBLE REDEEMABLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY - Range of Exercise Price (Details) - USD ($)
12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Options Outstanding    
Number Outstanding (in shares) 25,384,663  
Weighted Average Remaining Contractual Life 9 years 1 month 17 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.44  
Options Exercisable    
Number Vested and Exercisable (in shares) 5,193,472  
Weighted Average Exercise Prices (in dollars per share) $ 0.82  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures    
Total intrinsic value of options exercised $ 4,000 $ 65,000
$0.10 - $0.20    
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) $ 0.20  
Options Outstanding    
Number Outstanding (in shares) 13,408,000  
Weighted Average Remaining Contractual Life 9 years 10 months 24 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.13  
Options Exercisable    
Number Vested and Exercisable (in shares) 390,804  
Weighted Average Exercise Prices (in dollars per share) $ 0.13  
$0.21 - $0.35    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range    
Exercise prices, low end of range (in dollars per share) 0.21  
Exercise prices, high end of range (in dollars per share) $ 0.35  
Options Outstanding    
Number Outstanding (in shares) 611,441  
Weighted Average Remaining Contractual Life 5 years 8 months 12 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.31  
Options Exercisable    
Number Vested and Exercisable (in shares) 577,066  
Weighted Average Exercise Prices (in dollars per share) $ 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) 4,235,751  
Weighted Average Remaining Contractual Life 8 years 5 months 27 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.53  
Options Exercisable    
Number Vested and Exercisable (in shares) 2,072,114  
Weighted Average Exercise Prices (in dollars per share) $ 0.55  
$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) 5,539,471  
Weighted Average Remaining Contractual Life 8 years 8 months 23 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.76  
Options Exercisable    
Number Vested and Exercisable (in shares) 993,845  
Weighted Average Exercise Prices (in dollars per share) $ 0.83  
$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  
Weighted Average Remaining Contractual Life 7 years 1 month 10 days  
Weighted Average Exercise Prices (in dollars per share) $ 1.68  
Options Exercisable    
Number Vested and Exercisable (in shares) 1,059,643  
Weighted Average Exercise Prices (in dollars per share) $ 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  
Weighted Average Remaining Contractual Life 7 years 3 months  
Weighted Average Exercise Prices (in dollars per share) $ 3.00  
Options Exercisable    
Number Vested and Exercisable (in shares) 100,000  
Weighted Average Exercise Prices (in dollars per share) $ 3.00