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Stockholders' Equity
 3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stockholder's Equity
Stockholders’ Equity

Share-Based Compensation Expense
The following table summarizes share-based compensation expense for the periods shown:
 
Three Months Ended 
 March 31,
(In millions)
2019
 
2018
Cost of sales
$
2.3

 
$
2.2

Research and development
8.5

 
8.5

Selling, general and administrative
14.2

 
13.9

Total share-based compensation expense included in net loss
$
25.0

 
$
24.6


As of March 31, 2019, unrecognized estimated compensation costs related to unvested restricted stock units, or RSUs, and performance stock units, or PSUs, totaled $188.3 million and is expected to be recognized through 2021.
Restricted Stock Units
A summary of our RSU and PSU activity for the three months ended March 31, 2019 is as follows:
 
 
 
Weighted
 
 
 
 
 
Average
 
Aggregate
 
 
 
Grant Date
 
Intrinsic
(In millions, except weighted average grant date fair values)
Shares
 
Fair Value
 
Value
Nonvested at December 31, 2018
2.7

 
$
69.19

 
$
319.0

Granted
0.6

 
143.24

 
 
Vested
(0.9
)
 
65.77

 
 
Forfeited
(0.1
)
 
95.68

 
 
Nonvested at March 31, 2019
2.3

 
$
89.57

 
$
277.4



The total vest date fair value of RSUs that vested during the three months ended March 31, 2019 was $132.3 million. No PSUs vested during that period.