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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2017
Restricted stock award (RSAs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Stock and Restricted Stock Units Activity
The following table presents information regarding outstanding RSAs as of June 30, 2017 and changes during the six months then ended:
 
Number of RSAs Outstanding
 
Weighted Average Grant Date Fair Value Per Share
 
Aggregate Intrinsic Value
(in millions)
Balance at January 1, 2017
4,688,975

 
$
0.18

 
 
Converted
(35,212
)
 
 
 
 
Forfeited
(427,561
)
 
0.21

 
 
Balance at June 30, 2017
4,226,202

 
$
0.17

 
$
21.3
Restricted stock units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Stock and Restricted Stock Units Activity
The following table presents information regarding outstanding RSUs as of June 30, 2017 and changes during the six months then ended:
 
Number of RSUs Outstanding
 
Aggregate Intrinsic Value
(In millions)
 
Weighted Average 
Remaining
Contractual Life (In years)
Balance at January 1, 2017
2,311,687

 
 
 
 
Granted
648,207

 
 
 
 
Converted
(144,706
)
 
 
 
 
Forfeited
(478,673
)
 
 
 
 
Balance at June 30, 2017
2,336,515

 
$
11.8

 
1.2