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Share-Based Awards (Tables)
 9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Option Award Activity
The following table summarizes option award activity for the nine months ended September 30, 2020:
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, 202029,634,296 $35.95 6.28$331,107 
Granted5,037,920 50.76 
Exercised(11,779,104)31.52 
Forfeited or cancelled(916,931)42.00 
Outstanding at September 30, 202021,976,181 41.47 7.161,321,219 
Vested and exercisable at September 30, 202010,490,317 37.59 5.56671,352 
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
September 30,		Nine Months Ended
September 30,
 2020201920202019
Expected volatility52%45%
45%-52%
45%-47%
Expected dividend yield————
Risk-free interest rate0.22%1.61%
0.22%-0.93%
1.61%-2.53%
Weighted-average expected life4.50 years5.00 years
4.50-5.50 years
4.75-5.25 years
Weighted-average fair value of options granted$37.09$14.15$21.35$16.55
Summary of Restricted Stock Units Activity
The following table summarizes activity for restricted stock units for the nine months ended September 30, 2020:
Restricted
Stock Units		Weighted-
Average Grant-
Date Fair
Value
Unvested outstanding at January 1, 20207,052,767 $40.01 
Granted3,958,518 52.15 
Vested(2,191,719)41.17 
Forfeited(726,398)41.93 
Unvested outstanding at September 30, 20208,093,168 45.46 
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, unaudited):
 Three Months Ended
September 30,		Nine Months Ended
September 30,
 2020201920202019
Cost of revenue$1,617 $1,062 $3,909 $2,878 
Sales and marketing8,631 6,588 24,740 19,039 
Technology and development19,793 18,034 60,376 51,942 
General and administrative18,918 16,444 56,080 78,025 
Total$48,959 $42,128 $145,105 $151,884