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Related Parties (Details) - USD ($)
1 Months Ended 12 Months Ended
Nov. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]        
Due to affiliates   $ 0 $ 0  
Sublease        
Related Party Transaction [Line Items]        
Rent reimbursements related to sublease   80,000 70,000 $ 70,000
Payment for use of aircraft owned by executive   $ 10,000 $ 10,000 $ 40,000
Chairman and Chief Executive Officer        
Related Party Transaction [Line Items]        
Company stock sold, total $ 20,000,000      
Total common shares issued (in shares) 1,159,420      
Chairman        
Related Party Transaction [Line Items]        
Company stock sold per transaction $ 10,000,000      
Chief Executive Officer        
Related Party Transaction [Line Items]        
Company stock sold per transaction $ 10,000,000