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Stock-Based Compensation - Summary of Stock Option Activity and Related Information (Detail)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Options Outstanding  
Beginning balance (shares) | shares 8,310,235
Granted (shares) | shares 1,663,155
Exercised (shares) | shares (422,525)
Forfeited (shares) | shares (49,047)
Ending balance (shares) | shares 9,501,818
Vested and expected to vest (shares) | shares 9,225,654
Exercisable (shares) | shares 6,764,948
Weighted-Average Exercise Price per Share  
Beginning balance (USD per share) | $ / shares $ 7.97
Granted (USD per share) | $ / shares 10.84
Exercised (USD per share) | $ / shares 4.42
Forfeited (USD per share) | $ / shares 14.02
Ending balance (USD per share) | $ / shares 8.60
Vested and expected to vest (USD per share) | $ / shares 8.51
Exercisable (USD per share) | $ / shares $ 7.41
Weighted- Average Remaining Contractual Life  
Balance (in years) 6 years 5 months 8 days
Vested and expected to vest (in years) 6 years 4 months 9 days
Exercisable (in years) 5 years 5 months 12 days
Aggregate Intrinsic Value  
Balance | $ $ 23,678
Vested and expected to vest | $ 23,615
Exercisable | $ $ 23,051