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Stock-Based Compensation, Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Stock-Based Compensation [Abstract]      
Shares, Outstanding, Beginning Balance (in shares) 4,146,064    
Shares, Granted (in shares) 346,524    
Shares, Exercised (in shares) (469,442)    
Shares, Forfeited or expired (in shares) (166,494)    
Shares, Outstanding, Ending Balance (in shares) 3,856,652   4,146,064
Shares, Exercisable (in shares) 2,160,650    
Shares, Vested and expected to vest (in shares) 3,654,153    
Weighted- Average Exercise Price, Outstanding, Beginning Balance (in dollars per share) $ 16.90    
Weighted- Average Exercise Price, Granted (in dollars per share) 22.50    
Weighted- Average Exercise Price, Exercised (in dollars per share) 3.07    
Weighted- Average Exercise Price, Forfeited or expired (in dollars per share) 26.50    
Weighted- Average Exercise Price, Outstanding, Ending Balance (in dollars per share) 18.67   $ 16.90
Weighted- Average Exercise Price, Exercisable (in dollars per share) 12.86    
Weighted- Average Exercise Price, Vested and expected to vest (in dollars per share) $ 18.32    
Weighted- Average Remaining Contractual Term, Outstanding 7 years 2 months 12 days   7 years 4 months 24 days
Weighted- Average Remaining Contractual Term, Exercisable 6 years 1 month 6 days    
Weighted- Average Remaining Contractual Term, Vested and expected to vest 7 years 1 month 6 days    
Aggregate Intrinsic Value, Outstanding, Ending Balance $ 45,214    
Aggregate Intrinsic Value, Exercisable 37,400    
Aggregate Intrinsic Value, Vested and expected to vest $ 44,082    
Weighted-average grant-date fair value of options granted (in dollars per share) $ 14.81    
Intrinsic value of options exercised $ 9,600    
Cash received for options exercised 1,362 $ 632  
Fair value of shares vested 8,800    
Unrecognized compensation expense related to non-vested stock-options, net of related forfeiture estimates $ 24,200    
Unrecognized compensation expense recognition period 3 years