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Stock-Based Compensation - Stock Option Activity (Detail) - Employee Stock Option
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Number of Shares  
Stock Options, Beginning Balance 5,137,914
Shares granted to employee 5,713,899
Stock Options, Options forfeited (7,715)
Stock Options, Options exercised (1,032,742)
Stock Options, Ending Balance 9,811,356
Purchase of fully-vested incentive stock option 4,046,009
Weighted Average Exercise Price  
Shares granted at an exercise price | $ / shares $ 7.92
Weighted Average Exercise Price, Options forfeited | $ / shares 0.42
Weighted Average Exercise Price, Options exercised | $ / shares 0.82
Weighted Average Exercise Price, Outstanding Ending balance | $ / shares 4.97
Weighted Average Exercise Price, Vested and Exercisable | $ / shares $ 5.32
Aggregate Intrinsic Value  
Aggregate Intrinsic Value, Outstanding, Ending balance | $ $ 83,335
Aggregate Intrinsic Value, Vested and Exercisable | $ $ 34,694
Weighted Average Remaining Contractual Life  
Weighted Average Remaining Contractual Life, Outstanding, Ending balance 7 years 7 months 24 days
Weighted Average Remaining Contractual Life, Vested and Exercisable 8 years 2 months 5 days