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Stockholders' Equity - Summary of Warrant Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Warrants outstanding [Roll Forward]        
Outstanding, beginning of period (in shares) 850,138 929,495 352,664  
Issued (in shares) 17,469,500   589,500  
Exercised (in shares) (215,318) (49,139) (12,669)  
Expired (in shares) (45,320) (30,218)    
Outstanding, end of period (in shares) 18,059,000 850,138 929,495 352,664
Warrants, Exercise Price per Share [Roll Forward]        
Outstanding, (in dollars per share)       $ 19.20
Warrants, Weighted Average Exercise Price [Roll Forward]        
Outstanding, beginning of period (in dollars per share) $ 5.42 $ 5.40 $ 19.20  
Issued (in dollars per share) 0.80   7.04  
Exercised (in dollars per share) 0.82 2.56 19.20  
Expired (in dollars per share) 0.82 2.56    
Outstanding, end of period (in dollars per share) $ 1.00 $ 5.42 $ 5.40 $ 19.20
Weighted average remaining life 2 years 1 month 28 days 2 years 9 months 11 days 3 years 6 months 4 days 2 years 2 months 27 days
Minimum [Member]        
Warrants, Exercise Price per Share [Roll Forward]        
Outstanding, (in dollars per share) $ 0.74 $ 1.75 $ 2.56  
Maximum [Member]        
Warrants, Exercise Price per Share [Roll Forward]        
Outstanding, (in dollars per share) $ 7.04 $ 7.04 $ 7.04