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Share-Based Compensation - Significant Ranges of Outstanding and Exercisable Options (Details)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) $ 9.1
Range of Exercise prices, upper range limit (usd per share) $ 79.2
Options outstanding as of December 31, 2014 (shares) | shares 463,913
Weighted average remaining contractual life (years) 7 years 11 months 15 days
Weighted average exercise price (usd per share) $ 15.10
Options exercisable as of December 31, 2014 (shares) | shares 151,858
Weighted average exercise price of exercisable options (usd per share) $ 23.23
$9.10 - $9.10  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) 9.10
Range of Exercise prices, upper range limit (usd per share) $ 9.10
Options outstanding as of December 31, 2014 (shares) | shares 24,812
Weighted average remaining contractual life (years) 7 years 5 months 1 day
Weighted average exercise price (usd per share) $ 9.10
Options exercisable as of December 31, 2014 (shares) | shares 24,812
Weighted average exercise price of exercisable options (usd per share) $ 9.10
$9.63 - $9.63  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) 9.63
Range of Exercise prices, upper range limit (usd per share) $ 9.63
Options outstanding as of December 31, 2014 (shares) | shares 193,848
Weighted average remaining contractual life (years) 9 years 3 months 18 days
Weighted average exercise price (usd per share) $ 9.63
Options exercisable as of December 31, 2014 (shares) | shares 0
Weighted average exercise price of exercisable options (usd per share) $ 0.00
$9.72 - $13.32  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) 9.72
Range of Exercise prices, upper range limit (usd per share) $ 13.32
Options outstanding as of December 31, 2014 (shares) | shares 63,928
Weighted average remaining contractual life (years) 8 years 10 months 24 days
Weighted average exercise price (usd per share) $ 11.98
Options exercisable as of December 31, 2014 (shares) | shares 27,331
Weighted average exercise price of exercisable options (usd per share) $ 12.19
$13.40 - $13.60  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) 13.40
Range of Exercise prices, upper range limit (usd per share) $ 13.60
Options outstanding as of December 31, 2014 (shares) | shares 38,589
Weighted average remaining contractual life (years) 8 years 11 months 12 days
Weighted average exercise price (usd per share) $ 13.45
Options exercisable as of December 31, 2014 (shares) | shares 11,095
Weighted average exercise price of exercisable options (usd per share) $ 13.52
$14.51 - $14.51  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) 14.51
Range of Exercise prices, upper range limit (usd per share) $ 14.51
Options outstanding as of December 31, 2014 (shares) | shares 73,932
Weighted average remaining contractual life (years) 7 years 10 months 6 days
Weighted average exercise price (usd per share) $ 14.51
Options exercisable as of December 31, 2014 (shares) | shares 24,816
Weighted average exercise price of exercisable options (usd per share) $ 14.51
$16.80 - $48.80  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) 16.80
Range of Exercise prices, upper range limit (usd per share) $ 48.80
Options outstanding as of December 31, 2014 (shares) | shares 50,004
Weighted average remaining contractual life (years) 3 years 8 months 23 days
Weighted average exercise price (usd per share) $ 30.38
Options exercisable as of December 31, 2014 (shares) | shares 45,004
Weighted average exercise price of exercisable options (usd per share) $ 31.57
$51.20 - $57.40  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) 51.20
Range of Exercise prices, upper range limit (usd per share) $ 57.40
Options outstanding as of December 31, 2014 (shares) | shares 16,675
Weighted average remaining contractual life (years) 1 year 4 months 24 days
Weighted average exercise price (usd per share) $ 52.62
Options exercisable as of December 31, 2014 (shares) | shares 16,675
Weighted average exercise price of exercisable options (usd per share) $ 52.62
$64.80 - $64.80  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) 64.80
Range of Exercise prices, upper range limit (usd per share) $ 64.80
Options outstanding as of December 31, 2014 (shares) | shares 375
Weighted average remaining contractual life (years) 5 months 1 day
Weighted average exercise price (usd per share) $ 64.80
Options exercisable as of December 31, 2014 (shares) | shares 375
Weighted average exercise price of exercisable options (usd per share) $ 64.80
$73.20 - $73.20  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) 73.20
Range of Exercise prices, upper range limit (usd per share) $ 73.20
Options outstanding as of December 31, 2014 (shares) | shares 500
Weighted average remaining contractual life (years) 3 months 29 days
Weighted average exercise price (usd per share) $ 73.20
Options exercisable as of December 31, 2014 (shares) | shares 500
Weighted average exercise price of exercisable options (usd per share) $ 73.20
$79.20 - $79.20  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise prices, lower range limit (usd per share) 79.2
Range of Exercise prices, upper range limit (usd per share) $ 79.2
Options outstanding as of December 31, 2014 (shares) | shares 1,250
Weighted average remaining contractual life (years) 3 months
Weighted average exercise price (usd per share) $ 79.20
Options exercisable as of December 31, 2014 (shares) | shares 1,250
Weighted average exercise price of exercisable options (usd per share) $ 79.20