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Stockholders' Equity - Stock Option Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock Options, Number of Options [Roll Forward]        
Outstanding, beginning of period (in shares) 88 136 51  
Granted (in shares) 42   94  
Forfeited (in shares) (3) (48) (9)  
Outstanding, end of period (in shares) 127 88 136 51
Exercisable (in shares) 75      
Stock Options, Exercise Price per Share [Roll Forward]        
Granted (in dollars per share) $ 84.00   $ 6,664  
Forfeited (in dollars per share) 6,664.00      
Stock Options, Weighted Average Exercise Price [Roll Forward]        
Outstanding, beginning of period (in dollars per share) 12,815.73 $ 42,840.00 132,328.00  
Granted (in dollars per share) 84.00   6,664.00  
Forfeited (in dollars per share) 6,664.00 8,382.50 168,056.00  
Outstanding, beginning of period (in dollars per share) 8,750.55 $ 12,815.73 $ 42,840.00 $ 132,328.00
Exercisable (in dollars per share) $ 13,882.03      
Stock Options, Weighted Average Remaining Life Years [Abstract]        
Outstanding 7 years 9 months 14 days 7 years 10 months 24 days 8 years 11 months 12 days 8 years 9 months 29 days
Exercisable 7 years 1 month 6 days      
Minimum [Member]        
Stock Options, Exercise Price per Share [Roll Forward]        
Outstanding, beginning of period (in dollars per share) $ 6,644 $ 6,664 $ 6,944  
Forfeited (in dollars per share)   6,664 6,664  
Outstanding, end of period (in dollars per share) 84.00 6,644 6,664 $ 6,944
Exercisable (in dollars per share) 6,664.00      
Maximum [Member]        
Stock Options, Exercise Price per Share [Roll Forward]        
Outstanding, beginning of period (in dollars per share) 1,326,080 1,372,672 1,372,672  
Forfeited (in dollars per share)   190,848 949,760  
Outstanding, end of period (in dollars per share) 381,696.00 $ 1,326,080 $ 1,372,672 $ 1,372,672
Exercisable (in dollars per share) $ 381,696.00