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Stock-Based Compensation Expense - Summary of Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Number of shares under stock option, Beginning balance | shares 4,246,525
Number of shares Granted | shares 1,279,034
Number of shares Exercised | shares (576,154)
Number of shares forfeited/cancelled | shares (429,343)
Number of shares under stock option, Ending balance | shares 4,520,062
Number of stock options, Vested and exercisable | shares 2,725,099
Number of stock options, Vested or expected to vest | shares 4,174,837
Weighted average exercise price, Beginning balance | $ / shares $ 5.99
Weighted average exercise price, Stock options granted | $ / shares 13.12
Weighted average exercise price, Stock options exercised | $ / shares 4.29
Weighted average exercise price, Stock options forfeited/cancelled | $ / shares 10.69
Weighted average exercise price, Ending balance | $ / shares 7.89
Weighted average exercise price, Vested and exercisable | $ / shares 5.35
Weighted average exercise price, Vested and expected to vest | $ / shares $ 7.51
Weighted Average Remaining Contractual Life, Outstanding 7 years 4 months 24 days
Weighted Average Remaining Contractual Life, Vested and exercisable 6 years 6 months
Weighted Average Remaining Contractual Life, Vested and expected to vest 7 years 3 months 18 days
Stock options aggregate intrinsic value, Exercised | $ $ 5,791
Stock options aggregate intrinsic value, Outstanding | $ 44,403
Stock options aggregate intrinsic value, Exercisable | $ 33,624
Stock options aggregate intrinsic value, Vested and expected to vest | $ $ 42,556