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Stock-Based Compensation - Restricted Stock Award Activity (Details)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
RSAs [Roll Forward]  
Outstanding, end of year (in shares) 1,229,769
Restricted Stock  
RSAs [Roll Forward]  
Outstanding, beginning of year (in shares) 1,177,298
Granted (in shares) 1,030,435
Exercised (in shares) (924,182)
Forefeited (in shares) (53,782)
Outstanding, end of year (in shares) 1,229,769
Weighted Average Fair Value [Roll Forward]  
Outstanding, beginning of year (in USD per share) | $ / shares $ 1.02
Granted (in USD per share) | $ / shares 2.99
Exercised (in USD per share) | $ / shares 0.89
Forfeited (in USD per share) | $ / shares 2.70
Outstanding, end of year (in USD per share) | $ / shares $ 2.69