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Stockholders' Equity - Summary of Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Options outstanding at December 31, 2016, Number of Shares | shares 9,256,506
Options granted, Number of Shares | shares 3,091,125
Options exercised, Number of Shares | shares (2,030,815)
Options canceled, Number of Shares | shares (2,029,360)
Options outstanding at December 31, 2017, Number of Shares | shares 8,287,456
Options vested and expected to vest at December 31, 2017, Number of Shares | shares 8,287,456
Options exercisable at December 31, 2017, Number of Shares | shares 3,881,078
Options outstanding, Weighted-Average Exercise per Share Price, Beginning Balance | $ / shares $ 8.31
Options granted, Weighted-Average Exercise per Share Price | $ / shares 6.48
Options exercised, Weighted-Average Exercise per Share Price | $ / shares 7.76
Options canceled, Weighted-Average Exercise per Share Price | $ / shares 8.28
Options outstanding, Weighted-Average Exercise per Share Price, Ending Balance | $ / shares 7.77
Options vested and expected to vest at December 31, 2017, Weighted-Average Exercise Per Share Price | $ / shares 7.77
Options exercisable at December 31, 2017, Weighted-Average Exercise per Share Price | $ / shares $ 8.99
Options outstanding at December, 31, 2017, Weighted Average Remaining Contractual Term 6 years 8 months 8 days
Options vested and expected to vest at December, 31, 2017, Weighted Average Remaining Contractual Term 6 years 8 months 8 days
Options exercisable at December, 31, 2017, Weighted Average Remaining Contractual Term 4 years 1 month 17 days
Options outstanding at December 31, 2017, Aggregate Intrinsic Value | $ $ 71,658
Options vested and expected to vest at December 31, 2017, Aggregate Intrinsic Value | $ 71,658
Options exercisable at December 31, 2017, Aggregate Intrinsic Value | $ $ 28,864