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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Restricted Stock Units Award Activity
The following table summarizes the activities for our unvested RSUs for the six months ended June 30, 2019:
 
Unvested RSUs
 
Number of Shares
 
Weighted Average Grant Date Fair Value
 
(in thousands)
 
 
Unvested at December 31, 2018
67,298

 
$
144.77

Granted
41,695

 
$
167.10

Vested
(16,744
)
 
$
135.50

Forfeited
(5,852
)
 
$
136.21

Unvested at June 30, 2019
86,397

 
$
157.92