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Shareholders' Equity - 382 Rights Agreement (Details)
Aug. 07, 2015
day
right
$ / shares
shares
Dec. 31, 2017
$ / shares
Dec. 31, 2016
$ / shares
Class of Stock [Line Items]      
Beneficial ownership percentage 4.90%    
Class of warrant or right called by each warrant or right | right 1    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01
Acquiring person threshold 0.50%    
Business days for acquiring person | day 10    
Percentage of purchase price received upon exercise 200.00%    
Percentage transfer threshold assets, cashflow, and earning power 50.00%    
Ownership percentage for board of exchange rights 50.00%    
Right redemption price (dollars per share) $ 0.001    
Common Stock      
Class of Stock [Line Items]      
Class of warrant or right, number of securities called by each warrant or right (in shares) | shares 1    
Preferred Stock      
Class of Stock [Line Items]      
Class of warrant or right, number of securities called by each warrant or right (in shares) | shares 0.01    
Price per share of sale of stock (dollars per share) $ 15.00