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STOCKHOLDERS' EQUITY (Tables)
 3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Activity
A summary of stock option activity for the three months ended March 31, 2021 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, 202013,630,882 $17.84 3.84$2,723,394 
Exercised(2,592,301)12.69 
Balance at March 31, 202111,038,581 $19.06 4.18$2,295,969 
Options exercisable as of March 31, 20219,605,627 $12.66 3.51$2,059,368 
Schedule of Restricted Stock Awards and Restricted Stock Units Activity
Activity related to RSAs and RSUs during the three months ended March 31, 2021 is set forth below:
Number of
shares		Weighted
Average Grant
Date Fair Value
Unvested as of December 31, 202015,622,645 $71.71 
Granted571,632 202.58 
Vested(1,744,585)53.27 
Forfeited(209,512)78.71 
Unvested as of March 31, 202114,240,180 $79.12 
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,
20212020
Cost of revenue$99 $76 
Product development86,895 57,400 
Sales and marketing10,880 6,407 
General and administrative20,749 13,420 
Total$118,623 $77,303