Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Additional Information (Detail)

v3.19.1
Stockholders' Equity - Additional Information (Detail) - USD ($)
12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Preferred stock, shares authorized 5,000,000      
Preferred stock, shares issued 0      
Expected dividend yield 0.00% 0.00%    
Options outstanding 4,124,202 3,240,105    
Market based options granted 1,420,000      
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value $ 0.86 $ 1.34    
Market Based Options [Member] | CEO [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding     800,000 800,000
Fair value of options outstanding $ 2,100      
Service period required to be fulfilled 3 years      
Market based options granted 0 0    
Performance Stock Units (PSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized $ 900,000      
Share based compensation arrangement by share based payment award expected weighted average recognition period 2 years 1 month 6 days      
Restricted Stock Units And Deferred Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized $ 1,500,000      
Share based compensation arrangement by share based payment award expected weighted average recognition period 1 year 9 months 18 days      
Restricted Stock Units And Deferred Stock Units | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by Share-based payment award, vesting period 1 year      
Restricted Stock Units And Deferred Stock Units | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by Share-based payment award, vesting period 3 years      
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized $ 2,200,000      
Share based compensation arrangement by share based payment award expected weighted average recognition period 2 years 2 months 12 days      
2011 Compensation and Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, Description Option awards may be granted to employees at an exercise price per share of not less than 100% of the fair market value per common share on the date of the grant      
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 100.00%      
Share-based compensation arrangement by share based payment award, Option award expiration period 10 years      
2011 Compensation and Incentive Plan [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by Share-based payment award, vesting period 1 year      
2011 Compensation and Incentive Plan [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by Share-based payment award, vesting period 3 years      
2011 Compensation and Incentive Plan [Member] | Stock Compensation Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, number of shares authorized 9,300,000      
Share-based compensation arrangement by share-based payment award, number of shares available for grant 1,616,179      
2011 Compensation and Incentive Plan [Member] | Deferred Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by Share-based payment award, vesting period 1 year      
Two Thousand Fifteen Employee Stock Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, number of shares available for grant 1,094,783      
Share-based compensation arrangement by share-based payment award, Description On each purchase date, eligible employees can purchase our stock at a price per share equal to 85% of the closing price of our common stock on the exercise date, but no less than par value      
Percentage of stock to be purchased under the plan 85.00%      
Shares purchased under ESPP 12,794 24,467    
Two Thousand Fifteen Employee Stock Purchase Plan | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, number of shares authorized 1,150,000      
Long Term Incentive Program | Performance Stock Units (PSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by Share-based payment award, vesting period 3 years 3 years 3 years  
Service period required to be fulfilled     3 years  
Number of stock units granted 210,000 232,500 307,963