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Stockholders' Equity and Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Apr. 30, 2017
Apr. 30, 2017
Apr. 30, 2016
Feb. 01, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation cost $ 6,752 $ 6,752    
Weighted average period over which unrecognized compensation cost is expected to be recognized   1 year 11 months 16 days    
Service-Based Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant date per share for stock options   $ 4.84 $ 4.18  
Time-Based Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant date per share for stock options   $ 13.01    
Time-Based Restricted Stock Units [Member] | Certain Executives [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock units granted 337,000      
Vesting period 2 years      
ASU 2016-09 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Increase to accumulated deficit with offset to additional paid-in-capital       $ 34