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Stock-Based Compensation, Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Stock-Based Compensation [Abstract]      
Shares, Outstanding, Beginning Balance (in shares) 4,146,064    
Shares, Granted (in shares) 110,125    
Shares, Exercised (in shares) (190,867)    
Shares, Forfeited or expired (in shares) (46,598)    
Shares, Outstanding, Ending Balance (in shares) 4,018,724   4,146,064
Shares, Exercisable (in shares) 1,984,117    
Shares, Vested and expected to vest (in shares) 3,782,077    
Weighted- Average Exercise Price, Outstanding, Beginning Balance (in dollars per share) $ 16.90    
Weighted- Average Exercise Price, Granted (in dollars per share) 14.42    
Weighted- Average Exercise Price, Exercised (in dollars per share) 1.18    
Weighted- Average Exercise Price, Forfeited or expired (in dollars per share) 29.07    
Weighted- Average Exercise Price, Outstanding, Ending Balance (in dollars per share) 17.44   $ 16.90
Weighted- Average Exercise Price, Exercisable (in dollars per share) 9.50    
Weighted- Average Exercise Price, Vested and expected to vest (in dollars per share) $ 17.06    
Weighted- Average Remaining Contractual Term, Outstanding 7 years 4 months 24 days   7 years 4 months 24 days
Weighted- Average Remaining Contractual Term, Exercisable 5 years 10 months 24 days    
Weighted- Average Remaining Contractual Term, Vested and expected to vest 7 years 3 months 18 days    
Aggregate Intrinsic Value, Outstanding, Ending Balance $ 27,049    
Aggregate Intrinsic Value, Exercisable 22,670    
Aggregate Intrinsic Value, Vested and expected to vest $ 26,382    
Weighted-average grant-date fair value of options granted (in dollars per share) $ 12.82    
Intrinsic value of options exercised $ 4,300    
Cash received for options exercised 224 $ 255  
Fair value of shares vested 2,000    
Unrecognized compensation expense related to non-vested stock-options, net of related forfeiture estimates $ 28,100    
Unrecognized compensation expense recognition period 3 years