Common Stock and Stockholders' Equity - Summary of Stock Option and RSU Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
	May 06, 2016	Dec. 31, 2017	Dec. 31, 2016
Shares Available for Grant
Balance at the beginning of the period (in shares)		6,039
Increase in authorized shares (in shares)		4,833
Stock options granted (in shares)		(1,203)
RSUs granted (in shares)		(3,647)
Stock options forfeited or canceled (in shares)		579
RSUs forfeited or cancelled (in shares)		1,400
Balance at the end of the period (in shares)		8,001	6,039
Number of Shares
Balance at the beginning of the period (in shares)		8,479
Stock options granted (in shares)	1,200	1,203
Stock options exercised (in shares)		(2,664)
Stock options forfeited or canceled (in shares)		(579)
Stock options forfeited or canceled and unavailable for grant (in shares)		(200)
Balance at the end of the period (in shares)		6,239	8,479
Options vested and expected to vest at the end of the period (in shares)		5,910
Options vested and exercisable at the end of the period (in shares)		3,243
Weighted-Average Exercise Price
Balance at the beginning of the period (usd per share)		$ 14.52
Stock options granted (usd per share)		28.14
Stock options exercised (usd per share)		11.97
Stock options forfeited or canceled (usd per share)		21.49
Stock options forfeited or canceled and unavailable for grant (usd per share)		23.44
Balance at the end of the period (usd per share)		17.31	$ 14.52
Options vested and expected to vest at the end of the period (usd per share)		16.95
Options vested and exercisable at the end of the period (usd per share)		$ 14.01
Weighted Average Remaining Contractual Term
Options outstanding, weighted-average remaining contractual term		7 years 1 month 9 days	7 years 5 months 26 days
Options vested and expected to vest, weighted-average remaining contractual term		7 years 14 days
Options vested and exercisable, weighted-average remaining contractual term		6 years 4 months 24 days
Aggregate Intrinsic Value
Options outstanding, aggregate intrinsic value		$ 103,380	$ 66,449
Options vested and expected to vest, aggregate intrinsic value		99,958
Options vested and exercisable, aggregate intrinsic value		$ 64,311
Outstanding RSUs
Balance at the beginning of the period (in shares)		6,936
RSUs issued pursuant to retention plan, in connection with the acquisition (in shares)		3,647
RSUs vested (in shares)		(3,145)
RSUs forfeited or cancelled (in shares)		(1,400)
RSUs forfeited or canceled and unavailable for grant (in shares)		(211)
Balance at the end of the period (in shares)		5,827	6,936
Weighted-Average Grant Date Fair Value
Balance at the beginning of the period (usd per share)		$ 20.81
RSUs granted (usd per share)		28.09
RSUs vested (usd per share)		20.62
RSUs forfeited or cancelled (usd per share)		22.39
RSUs forfeited or canceled and unavailable for grant (usd per share)		23.44
Balance at the end of the period (usd per share)		$ 25.00	$ 20.81