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Share-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Sep. 30, 2014
Dec. 31, 2016
Dec. 01, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement by share-based payment award, description   Options and restricted stock units granted to our non-employee directors vest in full upon the earlier of (i) one full year of service on the Board following date of grant or (ii) the date of the next annual meeting of stockholders.  
Total unrecognized share-based compensation cost related to stock options   $ 3.3  
Stock options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Service period of share-based compensation vested, years   4 years  
Total unrecognized share-based compensation cost, weighted-average period, years   8 months 12 days  
Stock options [Member] | Share-based compensation granted after December 5, 2012 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expire from date of grant, years   8 years  
Stock options [Member] | Share-based compensation granted prior to December 5, 2012 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expire from date of grant, years   10 years  
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Service period of share-based compensation vested, years 4 years    
Total unrecognized share-based compensation cost, weighted-average period, years   2 years 6 months 18 days  
Total unrecognized share-based compensation cost related to RSUs   $ 41.1  
2012 Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares approved   2,000,000  
Shares issued under the Plan   900,000  
The 2010 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares approved     2,500,000
Shares reserved for issuance exercise of options   2,700,000  
The 2010 Plan [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future grant   2,400,000  
Non Employee Director [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Service period of share-based compensation vested, years   1 year