Stockholders’ Equity and Stock-Based Compensation

3 Months Ended

Mar. 31, 2022

Share-based Payment Arrangement [Abstract]

Stockholders’ Equity and Stock-Based Compensation

Stock Repurchase Program

In April 2019, our board of directors authorized a $1.0 billion stock repurchase program (the "Repurchase Program"). This authorization allowed us to repurchase shares of our common stock over three years, and we completed our repurchases under the Repurchase Program during the fourth quarter of 2021. In the fourth quarter of 2021, our board of directors authorized an additional $1.0 billion stock repurchase program (the “New Repurchase Program”), which allows us to repurchase shares of our common stock to be funded from working capital. Repurchases may be made at management’s discretion from time to time on the open market, through privately negotiated transactions, transactions structured through investment banking institutions, block purchases, trading plans under Rule 10b5-1 of the Exchange Act, or a combination of the foregoing. The New Repurchase Program commenced in November 2021 and expires on the three year anniversary thereof. The New Repurchase Program does not obligate us to acquire any of our common stock, and may be suspended or discontinued by us at any time without prior notice. As of March 31, 2022, the remaining authorized amount for stock repurchases under this program was approximately $790.8 million.

A summary of the stock repurchase activity under the New Repurchase Program is as follows (in thousands, except per share amounts):


	Three Months Ended
	March 31, 2022
Aggregate purchase price	$	136,228
Shares repurchased	1,171
Average price paid per share	$	116.30

The aggregate purchase price of repurchased shares of our common stock is recorded as a reduction to retained earnings. All shares repurchased have been retired.

Equity Award Plan Activities

2014 Equity Incentive Plan

In April 2014, our board of directors and stockholders approved the 2014 Equity Incentive Plan (the “2014 Plan”), effective on the first day that our common stock was publicly traded, and simultaneously terminated the 2004 and 2011 equity plans as to future grants. However, these plans will continue to govern the terms and conditions of the outstanding options previously granted thereunder.

Awards granted under the 2014 Plan could be in the form of Incentive Stock Options (“ISOs”), Nonstatutory Stock Options (“NSOs”), Restricted Stock Units (“RSUs”), Restricted Stock Awards (“RSAs”) or Stock Appreciation Rights (“SARs”). The number of shares available for grant and issuance under the 2014 Plan increases automatically on January 1 of each year commencing with 2016 by the number of shares equal to 3% of the outstanding shares of our common stock on the immediately preceding December 31, but not exceed 50,000,000 shares (the “2014 Plan Evergreen Increase”), unless our board of directors, in its discretion, determines to make a smaller increase. Effective January 1, 2022, our board of directors authorized an increase of 9,230,434 shares to the shares available for issuance under the 2014 Plan. As of March 31, 2022, there remained approximately 95.7 million shares available for issuance under the 2014 Plan.

2014 Employee Stock Purchase Plan

In April 2014, our board of directors and stockholders approved the 2014 Employee Stock Purchase Plan (the “ESPP”). The ESPP became effective on the first day that our common stock was publicly traded. The number of shares reserved for issuance under the ESPP increases automatically on January 1 of each year by the number of shares equal to 1% of our shares outstanding immediately preceding December 31, but not to exceed 10,000,000 shares, unless our board of directors, in its discretion, determines to make a smaller increase. Effective January 1, 2022, our board of directors authorized an increase of 3,076,811 shares to the shares available for issuance under our 2014 Employee Stock Purchase Plan (the “ESPP”). During the three months ended March 31, 2022, we issued 240,394 shares at a weighted-average purchase price of $48.75 per share under the ESPP. As of March 31, 2022, there remained 20.8 million shares available for issuance under the ESPP.

Stock Option Activities

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



	Number of Shares Underlying Outstanding Options	Weighted- Average Exercise Price per Share		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value of Stock Options Outstanding
Balance—December 31, 2021	8,685	$	12.45	2.8	$	1,140,369
Options granted	—	—
Options exercised	(737)	10.09
Options canceled	(121)	18.11
Balance—March 31, 2022	7,827	$	12.58	2.6	$	989,294
Vested and exercisable—March 31, 2022	6,304	$	10.07	2.2	$	812,692

Restricted Stock Unit (RSU) Activities

A summary of the RSU activity is 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, 2021	7,821	$	70.98	1.7	$	1,124,229
RSUs granted	758	107.79
RSUs vested	(742)	64.21
RSUs forfeited/canceled	(108)	70.81
Unvested balance—March 31, 2022	7,729	$	75.24	1.6	$	1,074,204

Stock-Based Compensation Expense

The following table summarizes the stock-based compensation expense related to our equity awards (in thousands):


	Three Months Ended March 31,
	2022		2021
Cost of revenue	$	1,309	$	1,400
Research and development	27,576		21,982
Sales and marketing	13,109		10,085
General and administrative	8,285		4,086
Total stock-based compensation	$	50,279	$	37,553

As of March 31, 2022, there were $501.4 million of unamortized compensation costs related to all unvested awards. The unamortized compensation costs are expected to be recognized over a weighted-average period of approximately 3.2 years.