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Stock-Based Compensation (Outstanding Stock Options Grants) (Details) - Employee Stock Option
12 Months Ended
Dec. 31, 2015
$ / shares
shares
$1.64 - $3.43  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price Range, Lower Range Limit $ 1.64
Exercise Price Range, Upper Range Limit $ 3.43
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]  
Granted Stock Options Outstanding | shares 718,482
Weighted- Average Remaining Contractual Life (Years) 2 years 2 months 19 days
Weighted- Average Exercise Price $ 2.64
Granted Stock Options Exercisable | shares 718,482
Weighted- Average Exercise Price $ 2.64
$3.43 - $4.42  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price Range, Lower Range Limit 3.45
Exercise Price Range, Upper Range Limit $ 4.42
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]  
Granted Stock Options Outstanding | shares 870,847
Weighted- Average Remaining Contractual Life (Years) 3 years 5 months 23 days
Weighted- Average Exercise Price $ 4.07
Granted Stock Options Exercisable | shares 870,847
Weighted- Average Exercise Price $ 4.07
$4.50 - $9.39  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price Range, Lower Range Limit 4.50
Exercise Price Range, Upper Range Limit $ 9.39
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]  
Granted Stock Options Outstanding | shares 757,472
Weighted- Average Remaining Contractual Life (Years) 4 years 7 months 20 days
Weighted- Average Exercise Price $ 7.00
Granted Stock Options Exercisable | shares 730,372
Weighted- Average Exercise Price $ 6.92
$9.46 - $13.01  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price Range, Lower Range Limit 9.46
Exercise Price Range, Upper Range Limit $ 13.01
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]  
Granted Stock Options Outstanding | shares 501,072
Weighted- Average Remaining Contractual Life (Years) 7 years 5 months 19 days
Weighted- Average Exercise Price $ 11.36
Granted Stock Options Exercisable | shares 229,856
Weighted- Average Exercise Price $ 11.17
$13.02 - $13.17  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price Range, Lower Range Limit 13.02
Exercise Price Range, Upper Range Limit $ 13.17
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]  
Granted Stock Options Outstanding | shares 785,833
Weighted- Average Remaining Contractual Life (Years) 8 years 1 month 9 days
Weighted- Average Exercise Price $ 13.17
Granted Stock Options Exercisable | shares 330,630
Weighted- Average Exercise Price $ 13.17
$113.22 - $14.08  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price Range, Lower Range Limit 13.22
Exercise Price Range, Upper Range Limit $ 14.08
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]  
Granted Stock Options Outstanding | shares 740,714
Weighted- Average Remaining Contractual Life (Years) 7 years 10 months 17 days
Weighted- Average Exercise Price $ 13.69
Granted Stock Options Exercisable | shares 259,564
Weighted- Average Exercise Price $ 13.82
$14.09 - $16.15  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price Range, Lower Range Limit 14.09
Exercise Price Range, Upper Range Limit $ 16.15
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]  
Granted Stock Options Outstanding | shares 740,901
Weighted- Average Remaining Contractual Life (Years) 7 years 7 months 10 days
Weighted- Average Exercise Price $ 14.88
Granted Stock Options Exercisable | shares 258,764
Weighted- Average Exercise Price $ 14.88
$16.17 - $17.60  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price Range, Lower Range Limit 16.17
Exercise Price Range, Upper Range Limit $ 17.60
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]  
Granted Stock Options Outstanding | shares 857,728
Weighted- Average Remaining Contractual Life (Years) 9 years 1 month 13 days
Weighted- Average Exercise Price $ 16.65
Granted Stock Options Exercisable | shares 117,722
Weighted- Average Exercise Price $ 16.58
$1.64 - $17.60  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price Range, Lower Range Limit 1.64
Exercise Price Range, Upper Range Limit $ 17.60
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]  
Granted Stock Options Outstanding | shares 5,973,049
Weighted- Average Remaining Contractual Life (Years) 6 years 3 months 10 days
Weighted- Average Exercise Price $ 10.42
Granted Stock Options Exercisable | shares 3,516,237
Weighted- Average Exercise Price $ 7.63