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Stockholders' Equity - Summary of Non-vested Options (Details) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Non-vested Options, Number of Options [Roll Forward]      
Non-vested, beginning of period (in shares) 25 101  
Granted (in shares) 42   94
Vested (in shares) (13) (45)  
Forfeited (in shares) (2) (114)  
Non-vested, end of period (in shares) 52 25 101
Non-vested Options, Weighted Average Exercise Price [Roll Forward]      
Non-vested, beginning of period (in dollars per share) $ 6,686.40 $ 7,892.50  
Granted (in dollars per share) 84    
Vested (in dollars per share) 6,707.08 9,397.50  
Forfeited (in dollars per share) 6,664.00 6,730.50  
Non-vested, end of period (in dollars per share) $ 1,349.38 $ 6,686.40 $ 7,892.50