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Equity Compensation (Range) (Details)
6 Months Ended
Jun. 30, 2017
$ / shares
shares
Options Outstanding  
Number of Underlying Shares | shares 2,824,811
Options Exercisable  
Number of Underlying Shares | shares 2,356,503
3.59-6.14  
Equity compensation  
Range of Exercise Price, low end of range (in dollars per share) $ 3.59
Range of Exercise Price, high end of range (in dollars per share) 6.14
Options Outstanding  
Weighted Average Exercise Price (in dollars per share) $ 5.97
Number of Underlying Shares | shares 904,662
Weighted-Average Remaining Contractual Life 3 years 10 months 24 days
Options Exercisable  
Number of Underlying Shares | shares 904,662
Weighted-Average Remaining Contractual Life 3 years 10 months 24 days
6.34-9.93  
Equity compensation  
Range of Exercise Price, low end of range (in dollars per share) $ 6.34
Range of Exercise Price, high end of range (in dollars per share) 9.93
Options Outstanding  
Weighted Average Exercise Price (in dollars per share) $ 8.45
Number of Underlying Shares | shares 391,363
Weighted-Average Remaining Contractual Life 6 years
Options Exercisable  
Number of Underlying Shares | shares 310,753
Weighted-Average Remaining Contractual Life 5 years 3 months 18 days
11.28-16.97  
Equity compensation  
Range of Exercise Price, low end of range (in dollars per share) $ 11.28
Range of Exercise Price, high end of range (in dollars per share) 16.97
Options Outstanding  
Weighted Average Exercise Price (in dollars per share) $ 13.91
Number of Underlying Shares | shares 892,486
Weighted-Average Remaining Contractual Life 6 years 9 months 18 days
Options Exercisable  
Number of Underlying Shares | shares 605,003
Weighted-Average Remaining Contractual Life 6 years 8 months 12 days
17.66-22.92  
Equity compensation  
Range of Exercise Price, low end of range (in dollars per share) $ 17.66
Range of Exercise Price, high end of range (in dollars per share) 22.92
Options Outstanding  
Weighted Average Exercise Price (in dollars per share) $ 20.98
Number of Underlying Shares | shares 636,300
Weighted-Average Remaining Contractual Life 6 years 6 months
Options Exercisable  
Number of Underlying Shares | shares 536,085
Weighted-Average Remaining Contractual Life 6 years 6 months