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Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Summary of Stock Options and SAR Activity

A summary of stock option and SAR activity for the nine months ended September 30, 2021 is as follows (in millions, except share amounts which are reflected in thousands, per share amounts, and years):

						SARs Outstanding Number of SARs						Options Outstanding Number of Shares						Weighted-Average Exercise Price Per Share						Weighted-Average Remaining Contractual Life (in years)						Aggregate Intrinsic Value
As of December 31, 2020						229						28,734						$	12.87					4.97						$	1,104
Assumed in connection with an acquisition (1)						—						4,314						$	5.10
Exercised						(58)						(7,954)						$	11.82
Canceled and forfeited						(7)						(400)						$	18.99
As of September 30, 2021						164						24,694						$	11.76					4.38						$	821
Vested and expected to vest as of September 30, 2021						135						18,008						$	8.76					3.60						$	671
Exercisable as of September 30, 2021						135						18,008						$	8.76					3.60						$	671

(1) Refer to Note 16 – Business Combinations for additional information on our acquisition of Cornershop Cayman.

Schedule of Restricted Stock Units Activity

The following table summarizes the activity related to our RSUs for the nine months ended September 30, 2021 (in thousands, except per share amounts):

						Number of Shares						Weighted-Average  Grant-Date Fair  Value per Share
Unvested and outstanding as of December 31, 2020						83,736						$	34.17
Granted						40,031						$	51.55
Vested						(29,500)						$	37.32
Canceled and forfeited						(19,106)						$	37.23
Unvested and outstanding as of September 30, 2021						75,161						$	41.45

Schedule of Stock-Based Compensation Expense by Function

The following table summarizes total stock-based compensation expense by function (in millions):

						Three Months Ended September 30,												Nine Months Ended September 30,
						2020						2021						2020						2021
Operations and support						$	16					$	42					$	52					$	107
Sales and marketing						11						18						35						60
Research and development						102						152						341						434
General and administrative						54						69						163						233
Total						$	183					$	281					$	591					$	834

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