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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2020
Equity [Abstract]  
Restricted Stock Units Award Activity

The following table summarizes the activities for our unvested RSUs for the three months ended March 31, 2020:
 
Unvested RSUs
 
Number of Shares
 
Weighted-Average Grant Date Fair Value
 
(in thousands)
 
 
Unvested at December 31, 2019
78,851

 
$
165.74

Granted
39,387

 
$
155.99

Vested
(8,388
)
 
$
155.51

Forfeited
(1,629
)
 
$
159.15

Unvested at March 31, 2020
108,221

 
$
163.08