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Share-Based Compensation - Summary of Share Option Activity (Detail) - 2014 Plan [Member]
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding, Number of Shares, Beginning Balance | shares 3,767,130
Granted, Number of Shares | shares 830,420
Exercised, Number of Shares | shares (507,632)
Forfeited or cancelled, Number of Shares | shares (73,328)
Outstanding, Number of Shares, Ending Balance | shares 4,016,590
Options exercisable, Number of Shares | shares 2,451,584
Options unvested, Number of Shares | shares 1,565,006
Outstanding, Weighted Average Exercise Price, Beginning Balance | $ / shares $ 12.69
Granted, Weighted Average Exercise Price | $ / shares 44.77
Exercised, Weighted Average Exercise Price | $ / shares 10.07
Forfeited or cancelled, Weighted Average Exercise Price | $ / shares 19.93
Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares 19.47
Options exercisable, Weighted Average Exercise Price | $ / shares 10.11
Options unvested, Weighted Average Exercise Price | $ / shares $ 34.14
Outstanding, Weighted Average Remaining Contractual Term 7 years 2 months 26 days
Options exercisable, Weighted Average Remaining Contractual Term 6 years 6 months 3 days
Options unvested, Weighted Average Remaining Contractual Term 8 years 4 months 20 days
Outstanding, Aggregate Intrinsic Value | $ $ 93,520
Options exercisable, Aggregate Intrinsic Value | $ 78,280
Options unvested, Aggregate Intrinsic Value | $ $ 15,240