Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

v3.4.0.3
Stockholders' Equity - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 06, 2016
Jul. 31, 2015
Jun. 30, 2015
Apr. 30, 2016
Jan. 31, 2016
Jul. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Market based options granted       800,000    
Officer [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, options, vested in period, fair value       $ 2.2    
Share-based compensation arrangement by share-based payment award, options, vested in period       1 year 10 months 24 days    
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized       $ 1.8    
CEO [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Market based options granted 600,000          
Chief Operating Officer [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Market based options granted     200,000      
Compensation and Incentive Plan 2011 [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           5,300,000
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, Option award expiration period       10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent       100.00%    
Compensation and Incentive Plan 2011 [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation arrangement by Share-based payment award, Option award vesting period       1 year    
Compensation and Incentive Plan 2011 [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation arrangement by Share-based payment award, Option award vesting period       4 years    
Compensation and Incentive Plan 2011 [Member] | Stock Compensation Plan [Member]            
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       1,629,384    
2015 Employee Stock Purchase Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, Description       On each purchase date, eligible employees will 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.    
Minimum payroll deductions at base compensation under employee stock purchase plan   1.00%        
Maximum payroll deductions at base compensation under employee stock purchase plan   15.00%        
Offering period commence date   Oct. 01, 2015        
Percentage of stock to be purchased under the plan   85.00%        
2015 Employee Stock Purchase Plan [Member] | 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 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation arrangement by Share-based payment award, Option award vesting period         3 years