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Stockholders' Equity and Compensation Arrangements Share - Based Compensation Activity (Tables)
 6 Months Ended
Jun. 30, 2017
Stockholders' Equity Note [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity
The table below summarizes the stock option activity for the six months ended June 30, 2017:
 
 
Options
 
Weighted- Average Exercise Price
 
Weighted- Average Remaining Contractual Term (in years)
 
Aggregate Intrinsic Value
(in thousands) (1)
Outstanding and exercisable at December 31, 2016
 
991,172

 
$
0.77

 
2.83
 
$
2,527

    Exercised
 
(9,601
)
 
1.97

 
 
 
 
    Forfeited
 
(1,501
)
 
1.72

 
 
 
 
Outstanding and exercisable at June 30, 2017
 
980,070

 
$
0.77

 
2.34
 
$
3,009

(1)
The aggregate intrinsic value of options outstanding and exercisable represents the total pretax intrinsic value (the difference between the fair value of the Company's stock on the last day of each period and the exercise price, multiplied by the number of options where the fair value exceeds the exercise price) that would have been received by the option holders had all option holders exercised their options as of June 30, 2017 and December 31, 2016, respectively.
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The table below summarizes activity regarding unvested restricted stock units granted under the Plans for the six months ended June 30, 2017:

 
 
Restricted Stock Units
 
Weighted- Average Grant Date Fair Value (per share)
Unvested at December 31, 2016
 
25,407,846

 
$
5.18

    Granted
 
18,147,526

 
$
3.74

    Vested
 
(9,075,003
)
 
$
5.27

    Forfeited
 
(4,060,667
)
 
$
5.15

Unvested at June 30, 2017
 
30,419,702

 
$
4.30