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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2020
Equity [Abstract]  
Restricted Stock Units Award Activity
The following table summarizes the activities for our unvested RSUs for the nine months ended September 30, 2020:
 
Unvested RSUs
 
Number of Shares
 
Weighted-Average Grant Date Fair Value
 
(in thousands)
 
 
Unvested at December 31, 2019
78,851

 
$
165.74

Granted
56,546

 
$
180.84

Vested
(28,388
)
 
$
159.74

Forfeited
(3,952
)
 
$
162.91

Unvested at September 30, 2020
103,057

 
$
175.78