Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock-based Compensation Expense

Total stock-based compensation expense related to options, restricted stock awards, employee stock purchases, restricted stock units and stock purchase rights granted were allocated as follows (in thousands):

	Three Months Ended March 31,
	2015		2014
Cost of revenue	$	636	$	211
Research and development	4,928		2,467
Sales and marketing	2,409		1,428
General and administrative	866		676
Total stock-based compensation	$	8,839	$	4,782

Schedule of Option and RSA Activity

The following table summarizes the option and RSA (Restricted Stock Award) activity under our equity stock plans and related information:

			Options and RSAs Outstanding
	Shares Available for Grant (in thousands)		Number of Shares Underlying Outstanding Options and RSAs  (in thousands)		Weighted- Average Exercise Price per Share		Weighted- Average Remaining Contractual Term (Years) of Stock Options	Aggregate Intrinsic Value of Stock Options Outstanding (in thousands)
Outstanding—December 31, 2014	11,612		13,654		$	17.63	8.3	$	598,775
Options granted	(283	)	283		66.05
Options exercised	—		(773	)	6.92
Options canceled	221		(221	)	20.66
Early exercised shares repurchased	10		—		3.95
Outstanding—March 31, 2015	11,560		12,943		$	19.27	8.1	$	661,984
Vested and exercisable—March 31, 2015			3,371		$	6.29	7.2	$	216,548
Vested and expected to vest—March 31, 2015			11,454		$	17.80	8.0	$	605,313

Schedule of Nonvested Restricted Stock Units Activity

A summary of the RSU activity under our stock plans during the reporting period and a summary of information related to RSUs expected to vest are presented below (in thousands, except per share and year amounts):

	Number of Shares		Weighted- Average Grant Date Fair Value Per Share		Weighted-Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
Unvested balance—December 31, 2014	108		$	75.56	2.0	$	6,557
RSUs granted	72		67.37
RSUs vested	—		—
RSUs forfeited/canceled	(3	)	73.10
Unvested balance—March 31, 2015	177		$	72.27	1.9	$	12,480
RSUs expected to vest—March 31, 2015	156		$	72.27	1.8	$	10,974