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Share-Based Awards (Tables)
 3 Months Ended
Mar. 31, 2020
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Option Award Activity
The following table summarizes option award activity for the three months ended March 31, 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  
Granted4,358,433  49.35  
Exercised(3,207,375) 28.75  
Forfeited or cancelled(297,139) 41.01  
Outstanding at March 31, 202030,488,215  38.57  6.8788,874  
Vested and exercisable at March 31, 202016,563,984  34.13  5.1280,208  
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
March 31,
 20202019
Expected volatility45%-48%46%-47%
Expected dividend yield——
Risk-free interest rate0.87%-0.93%2.38%-2.53%
Weighted-average expected life5.00-5.50 years4.75-5.25 years
Weighted-average fair value of options granted$20.75$16.77
Summary of Restricted Stock Units Activity
The following table summarizes activity for restricted stock units for the three months ended March 31, 2020:
Restricted
Stock Units		Weighted-
Average Grant-
Date Fair
Value
Unvested outstanding at January 1, 20207,052,767  $40.01  
Granted3,323,261  49.02  
Vested(638,909) 38.49  
Forfeited or cancelled(314,790) 40.71  
Unvested outstanding at March 31, 20209,422,329  43.27  
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
March 31,
 20202019
Cost of revenue$1,173  $881  
Sales and marketing6,993  5,650  
Technology and development18,917  15,508  
General and administrative16,712  44,085  
Total$43,795  $66,124