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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 SARsOptions Outstanding Number of SharesWeighted-Average Exercise Price Per ShareWeighted-Average Remaining Contractual Life (in years)Aggregate Intrinsic Value
As of December 31, 2020229 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, 2021164 24,694 $11.76 4.38$821 
Vested and expected to vest as of September 30, 2021135 18,008 $8.76 3.60$671 
Exercisable as of September 30, 2021135 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 SharesWeighted-Average
 Grant-Date Fair
 Value per Share
Unvested and outstanding as of December 31, 202083,736 $34.17 
Granted40,031 $51.55 
Vested(29,500)$37.32 
Canceled and forfeited(19,106)$37.23 
Unvested and outstanding as of September 30, 202175,161 $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,
2020202120202021
Operations and support$16 $42 $52 $107 
Sales and marketing11 18 35 60 
Research and development102 152 341 434 
General and administrative54 69 163 233 
Total$183 $281 $591 $834