Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Shares Repurchased

A summary of the stock repurchase activity under the Repurchase Program for the three months ended March 31, 2020 is as follows (in thousands, except per share amounts):

	Three Months Ended
	March 31, 2020
Aggregate purchase price	$	227,895
Shares repurchased	1,209
Average price paid per share	$	188.61

Schedule of Option Activity

The following table summarizes the option activity under our stock plans and related information (in thousands, except years and per share amounts):

	Options Outstanding
	Number of Shares Underlying Outstanding Options		Weighted- Average Exercise Price per Share		Weighted- Average Remaining Contractual Term (Years) of Stock Options	Aggregate Intrinsic Value of Stock Options Outstanding
Balance—December 31, 2019	4,564		$	42.50	4.4	$	740,387
Options granted	—		—
Options exercised	(309	)	24.72
Options canceled	(16	)	199.60
Balance—March 31, 2020	4,239		$	43.23	4.2	$	681,292
Vested and exercisable—March 31, 2020	2,626		$	29.64	3.7	$	454,105

Schedule of Restricted Stock Units Activity

A summary of the RSU activity under the 2014 Plan and related information are presented below (in thousands, except years and per share 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, 2019	1,070		$	190.35	1.5	$	217,701
RSUs granted	350		207.22
RSUs vested	(122	)	146.47
RSUs forfeited/canceled	(42	)	229.04
Unvested balance—March 31, 2020	1,256		$	198.00	1.6	$	254,386

Schedule of Shares Available for Grant

The following table presents the stock activity and the total number of shares available for grant under the 2014 Plan as of March 31, 2020 (in thousands):

	Number of Shares
Balance—December 31, 2019	15,146
Authorized	2,292
Options granted	—
RSUs granted	(350	)
Options canceled	16
RSUs forfeited	42
Shares traded for taxes	7
Balance—March 31, 2020	17,153

Schedule of Stock-Based Compensation Expense

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

	Three Months Ended March 31,
	2020		2019
Cost of revenue	$	1,327	$	1,098
Research and development	15,928		13,131
Sales and marketing	6,396		6,534
General and administrative	3,905		3,528
Total stock-based compensation	$	27,556	$	24,291

Schedule of Unrecognized Stock-Based Compensation Expense

As of March 31, 2020, unrecognized stock-based compensation expenses by award type and their expected weighted-average recognition periods are summarized in the following table (in thousands, except years).

	March 31, 2020
	Stock Option		RSU		ESPP		Restricted Stock
Unrecognized stock-based compensation expense	$	38,896	$	222,371	$	8,560	$	3,569
Weighted-average amortization period	3.0 years		3.2 years		1.0 years		2.5 years