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Share-Based Awards (Tables)
6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
Summary of Option Award Activity The following table summarizes option award activity for the six months ended June 30, 2021:
Number
of Shares
Subject to
Existing
Options
Weighted-
Average
Exercise
Price Per
Share
Weighted-
Average
Remaining
Contractual
Life (Years)
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at January 1, 202120,051,051 $42.68 7.22$1,751,105 
Granted8,438,476 133.48 
Exercised(1,991,460)38.00 
Forfeited or cancelled(602,382)64.27 
Outstanding at June 30, 202125,895,685 72.12 7.761,405,360 
Vested and exercisable at June 30, 202110,615,442 44.43 6.16832,504 
Fair Value of Options Granted, Estimated at Date of Grant Using Black Scholes Merton Option Pricing Model
The fair value of options granted is estimated at the date of grant using the Black-Scholes-Merton option-pricing model, assuming no dividends and with the following assumptions for the periods presented:
 Three Months Ended
June 30,
Six Months Ended
June 30,
 2021202020212020
Expected volatility56%51%
52%-56%
45%-51%
Expected dividend yield
Risk-free interest rate0.74%0.33%
0.57%-0.90%
0.33%-0.93%
Weighted-average expected life4.50 years5.00 years
4.50-5.75 years
5.00-5.50 years
Weighted-average fair value of options granted$53.16$20.21$59.58$20.69
Summary of Restricted Stock Units Activity The following table summarizes activity for restricted stock units for the six months ended June 30, 2021:
Restricted
Stock Units
Weighted-
Average Grant-
Date Fair
Value
Unvested outstanding at January 1, 20217,316,557 $48.14 
Granted1,155,375 134.02 
Vested(1,592,564)47.76 
Forfeited(404,654)55.93 
Unvested outstanding at June 30, 20216,474,714 63.08 
Effects of Share Based Compensation in Consolidated Statements of Operations
The following table presents the effects of share-based compensation expense in our condensed consolidated statements of operations during the periods presented (in thousands):
 Three Months Ended
June 30,
Six Months Ended
June 30,
 2021202020212020
Cost of revenue$2,972 $1,364 $5,660 $2,766 
Sales and marketing13,350 9,116 23,237 16,109 
Technology and development34,951 21,421 61,042 40,109 
General and administrative37,122 20,450 62,129 37,162 
Total$88,395 $52,351 $152,068 $96,146