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STOCKHOLDERS' EQUITY (Tables)
 3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Activity
A summary of stock option activity for the three months ended March 31, 2020 is as follows (in thousands, except share and per share data):
Number of Stock Options Outstanding
Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term
(in years)		Aggregate
Intrinsic
Value
Balance at December 31, 201923,619,804  $12.66  4.89$1,191,746  
Exercised(3,396,568) 9.09  
Forfeited(20,135) 71.99  
Balance at March 31, 202020,203,101  $10.25  4.88$811,454  
Options exercisable as of March 31, 202018,862,499  $10.25  4.40$799,553  
Schedule of Restricted Stock Awards and Restricted Stock Units Activity
Activity related to RSAs and RSUs during the three months ended March 31, 2020 is set forth below:
Number of
shares		Weighted
Average Grant
Date Fair Value
Unvested as of December 31, 201913,917,461  $49.90  
Granted863,415  69.78  
Vested(1,829,201) 35.56  
Forfeited(350,181) 46.05  
Unvested as of March 31, 202012,601,494  $53.43  
Summary of the Effect of Share-Based Compensation on the Condensed Consolidated Statements of Operations
The following table summarizes the effects of share-based compensation on the Company's condensed consolidated statements of operations (in thousands):
Three Months Ended
March 31,
20202019
Cost of revenue$76  $21  
Product development57,400  42,649  
Sales and marketing6,407  6,202  
General and administrative13,420  12,216  
Total$77,303  $61,088