Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity - Narrative (Details)

v3.8.0.1
Shareholders' Equity - Narrative (Details)
12 Months Ended
Dec. 31, 2017
vote / shares
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Class of Stock [Line Items]    
Common Stock, shares authorized (in shares) 750,000,000 750,000,000
Issuance of Common Stock, par value (in dollars per share) | $ / shares $ 0.01 $ 0.01
Preferred Stock, shares authorized (in shares) 10,000,000  
Preferred Stock, par value (in dollars per share) | $ / shares $ 0.01  
Shares surrendered in lieu of cash payment (in shares) 6,895  
Designate shares of preferred stock (in shares) 10,000,000  
Votes per common share | vote / shares 1  
Common stock investments, available for sale    
Class of Stock [Line Items]    
Exercise of common stock warrants (in shares) 416,295  
Series A Preferred Stock    
Class of Stock [Line Items]    
Preferred Stock, shares authorized (in shares) 4,000,000  
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Series C Preferred Stock    
Class of Stock [Line Items]    
Preferred Stock, shares authorized (in shares) 500,000  
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Series D Preferred Stock    
Class of Stock [Line Items]    
Preferred Stock, shares authorized (in shares) 2,000,000  
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0