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Stockholder's Equity and Stock Based Compensation (Details 3) - Stock options to purchase common stock
shares in Thousands
12 Months Ended
Dec. 31, 2015
$ / shares
shares
$ 0.12 - $ 1.50  
Information regarding options outstanding  
Exercise Price, low end of range (in dollars per share) $ 0.12
Exercise Price, high end of range (in dollars per share) $ 1.50
Shares Outstanding  
Number of shares | shares 460
Weighted Average Remaining Contractual Term 4 years 1 month 10 days
Weighted Average Exercise Price (in dollars per share) $ 1.17
Shares Exercisable  
Number of shares | shares 460
Weighted Average Exercise Price (in dollars per share) $ 1.17
$ 2.38 - $ 4.24  
Information regarding options outstanding  
Exercise Price, low end of range (in dollars per share) 2.38
Exercise Price, high end of range (in dollars per share) $ 4.24
Shares Outstanding  
Number of shares | shares 390
Weighted Average Remaining Contractual Term 5 years 4 months 10 days
Weighted Average Exercise Price (in dollars per share) $ 2.74
Shares Exercisable  
Number of shares | shares 390
Weighted Average Exercise Price (in dollars per share) $ 2.74
$ 4.56 - $ 4.56  
Information regarding options outstanding  
Exercise Price, low end of range (in dollars per share) 4.56
Exercise Price, high end of range (in dollars per share) $ 4.56
Shares Outstanding  
Number of shares | shares 626
Weighted Average Remaining Contractual Term 6 years 3 months 15 days
Weighted Average Exercise Price (in dollars per share) $ 4.56
Shares Exercisable  
Number of shares | shares 611
Weighted Average Exercise Price (in dollars per share) $ 4.56
$ 4.74 - $ 5.44  
Information regarding options outstanding  
Exercise Price, low end of range (in dollars per share) 4.74
Exercise Price, high end of range (in dollars per share) $ 5.44
Shares Outstanding  
Number of shares | shares 142
Weighted Average Remaining Contractual Term 6 years 5 months 27 days
Weighted Average Exercise Price (in dollars per share) $ 4.79
Shares Exercisable  
Number of shares | shares 142
Weighted Average Exercise Price (in dollars per share) $ 4.79
$ 7.42 - $ 7.42  
Information regarding options outstanding  
Exercise Price, low end of range (in dollars per share) 7.42
Exercise Price, high end of range (in dollars per share) $ 7.42
Shares Outstanding  
Number of shares | shares 1,011
Weighted Average Remaining Contractual Term 6 years 11 months 19 days
Weighted Average Exercise Price (in dollars per share) $ 7.42
Shares Exercisable  
Number of shares | shares 1,011
Weighted Average Exercise Price (in dollars per share) $ 7.42
$ 9.24 - $ 31.67  
Information regarding options outstanding  
Exercise Price, low end of range (in dollars per share) 9.24
Exercise Price, high end of range (in dollars per share) $ 31.67
Shares Outstanding  
Number of shares | shares 463
Weighted Average Remaining Contractual Term 8 years 3 months
Weighted Average Exercise Price (in dollars per share) $ 23.05
Shares Exercisable  
Number of shares | shares 273
Weighted Average Exercise Price (in dollars per share) $ 18.32
$ 32.65 - $ 32.99  
Information regarding options outstanding  
Exercise Price, low end of range (in dollars per share) 32.65
Exercise Price, high end of range (in dollars per share) $ 32.99
Shares Outstanding  
Number of shares | shares 45
Weighted Average Remaining Contractual Term 3 years 9 months 15 days
Weighted Average Exercise Price (in dollars per share) $ 32.83
Shares Exercisable  
Number of shares | shares 35
Weighted Average Exercise Price (in dollars per share) $ 32.88
$ 40.50 - $ 40.50  
Information regarding options outstanding  
Exercise Price, low end of range (in dollars per share) 40.50
Exercise Price, high end of range (in dollars per share) $ 40.50
Shares Outstanding  
Number of shares | shares 255
Weighted Average Remaining Contractual Term 8 years 26 days
Weighted Average Exercise Price (in dollars per share) $ 40.50
Shares Exercisable  
Number of shares | shares 122
Weighted Average Exercise Price (in dollars per share) $ 40.50
$ 41.40 - $ 41.40  
Information regarding options outstanding  
Exercise Price, low end of range (in dollars per share) 41.40
Exercise Price, high end of range (in dollars per share) $ 41.40
Shares Outstanding  
Number of shares | shares 158
Weighted Average Remaining Contractual Term 8 years 29 days
Weighted Average Exercise Price (in dollars per share) $ 41.40
Shares Exercisable  
Number of shares | shares 76
Weighted Average Exercise Price (in dollars per share) $ 41.40
$ 41.91 - $ 41.91  
Information regarding options outstanding  
Exercise Price, low end of range (in dollars per share) 41.91
Exercise Price, high end of range (in dollars per share) $ 41.91
Shares Outstanding  
Number of shares | shares 227
Weighted Average Remaining Contractual Term 7 years 8 months 23 days
Weighted Average Exercise Price (in dollars per share) $ 41.91
Shares Exercisable  
Number of shares | shares 114
Weighted Average Exercise Price (in dollars per share) $ 41.91
$ 0.12 - $ 41.91  
Information regarding options outstanding  
Exercise Price, low end of range (in dollars per share) 0.12
Exercise Price, high end of range (in dollars per share) $ 41.91
Shares Outstanding  
Number of shares | shares 3,777
Weighted Average Remaining Contractual Term 6 years 7 months 10 days
Weighted Average Exercise Price (in dollars per share) $ 13.55
Shares Exercisable  
Number of shares | shares 3,234
Weighted Average Exercise Price (in dollars per share) $ 9.77