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CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY - Range of Exercise Price (Details) - USD ($)
12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Options Outstanding    
Number Outstanding (in shares) 23,722,869  
Weighted Average Remaining Contractual Life 7 years 10 months 17 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.37  
Options Exercisable    
Number Vested and Exercisable (in shares) 9,590,357  
Weighted Average Exercise Prices (in dollars per share) $ 0.55  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures    
Total intrinsic value of options exercised $ 26,000 $ 4,000
$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) 5,503,893  
Weighted Average Remaining Contractual Life 8 years 1 month 2 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.11  
Options Exercisable    
Number Vested and Exercisable (in shares) 2,619,037  
Weighted Average Exercise Prices (in dollars per share) $ 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) 11,347,484  
Weighted Average Remaining Contractual Life 9 years 7 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.22  
Options Exercisable    
Number Vested and Exercisable (in shares) 1,728,162  
Weighted Average Exercise Prices (in dollars per share) $ 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) 2,567,126  
Weighted Average Remaining Contractual Life 6 years 1 month 13 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.53  
Options Exercisable    
Number Vested and Exercisable (in shares) 1,974,108  
Weighted Average Exercise Prices (in dollars per share) $ 0.53  
$0.66 to $1.14    
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) $ 1.14  
Options Outstanding    
Number Outstanding (in shares) 3,266,554  
Weighted Average Remaining Contractual Life 6 years 5 months 5 days  
Weighted Average Exercise Prices (in dollars per share) $ 0.78  
Options Exercisable    
Number Vested and Exercisable (in shares) 2,265,302  
Weighted Average Exercise Prices (in dollars per share) $ 0.79  
$1.15 to $3.00    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range    
Exercise prices, low end of range (in dollars per share) 1.15  
Exercise prices, high end of range (in dollars per share) $ 3.00  
Options Outstanding    
Number Outstanding (in shares) 1,037,812  
Weighted Average Remaining Contractual Life 3 years 3 months  
Weighted Average Exercise Prices (in dollars per share) $ 1.79  
Options Exercisable    
Number Vested and Exercisable (in shares) 1,003,748  
Weighted Average Exercise Prices (in dollars per share) $ 1.80  
Options    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures    
Exercised 138,157