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Stock-Based Compensation - Stock Option Activity (Details) - Stock options - USD ($)
 12 Months Ended 13 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Stock option activity, Number of Shares        
Balance at the beginning of the period (in shares) 2,826,794 1,794,214    
Options granted (in shares) 940,250 1,049,521    
Options forfeited (in shares) (9,375)      
Options expired (in shares) (7,500) (1,000)    
Options exercised (in shares) (379,268) (15,941)    
Balance at the end of the period (in shares) 3,370,901 2,826,794 1,794,214 2,826,794
Options vested and expected to vest (in shares) 3,064,829      
Exercisable (in shares) 1,600,351 1,393,729 1,203,885 1,393,729
Weighted Average Exercise Price (Per Share)        
Balance at the beginning of the period (in dollars per share) $ 5.12 $ 1.66    
Options granted (in dollars per share) 15.94 10.99    
Options forfeited (in dollars per share) 18.75      
Options expired (in dollars per share) 11.46 10.31    
Options exercised (in dollars per share) 1.46 0.59    
Balance at the end of the period (in dollars per share) 8.50 5.12 $ 1.66 $ 5.12
Options vested and expected to vest (in dollars per share) 8.09      
Exercisable (in dollars per share) $ 3.99 $ 1.01 $ 0.59 $ 1.01
Additional information        
Weighted-Average Remaining Contractual Term, Balance outstanding 6 years 11 months 23 days 6 years 5 months 5 days 5 years 8 months 19 days  
Weighted-Average Remaining Contractual Term, Options vested and expected to vest 6 years 9 months 22 days      
Weighted-Average Remaining Contractual Term, Exercisable 5 years 1 month 6 days      
Aggregate Intrinsic Value, Balance outstanding $ 21,854,000 $ 30,863,000   $ 30,863,000
Aggregate Intrinsic Value, Options vested and expected to vest 21,048,000      
Aggregate Intrinsic Value, Exercisable 17,016,000      
Intrinsic value of options exercised $ 5,400,000 $ 155,000 $ 191,000  
The 2013 Plan        
Stock option activity, Number of Shares        
Options granted (in shares)       2,004,750