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Stockholders' Equity - Summary of Non-vested Options (Details) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Non-vested Options, Number of Options [Roll Forward]      
Non-vested, beginning of period (in shares) 226,101 118,610  
Granted (in shares) 524,250 165,000 130,328
Vested (in shares) (159,901) (46,737)  
Forfeited (in shares) (22,648) (10,772)  
Non-vested, end of period (in shares) 567,802 226,101 118,610
Non-vested Options, Weighted Average Exercise Price [Roll Forward]      
Non-vested, beginning of period (in dollars per share) $ 5.03 $ 20.76  
Granted (in dollars per share) 1.19 1.78  
Vested (in dollars per share) 5.36 26.35  
Forfeited (in dollars per share) 4.38 35.92  
Non-vested, end of period (in dollars per share) $ 1.42 $ 5.03 $ 20.76