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Related Party Arrangements - Narrative - Restricted Stock Agreement (Details) - Advisor [Member] - Advisor [Member] - USD ($)
12 Months Ended
Jun. 11, 2014
Dec. 31, 2017
Dec. 31, 2016
Restricted Stock [Member] | Tranche One [Member]      
Related Party Transaction [Line Items]      
Shares of restricted stock vesting percentage 50.00%    
Restricted Stock [Member] | Tranche Two [Member]      
Related Party Transaction [Line Items]      
Shares of restricted stock vesting percentage 50.00%    
Restricted Stock Agreement [Member]      
Related Party Transaction [Line Items]      
Issuance of restricted common stock to advisor (in shares) 488,281.25    
Issuance of restricted common stock to Advisor $ 5,000,000    
Restricted Stock Agreement [Member] | Restricted Stock [Member]      
Related Party Transaction [Line Items]      
Share price (in dollars per share) $ 10.24    
Restricted Stock Agreement [Member] | Restricted Stock [Member] | Tranche One [Member]      
Related Party Transaction [Line Items]      
Shares of restricted stock vesting percentage     50.00%
Restricted Stock Agreement [Member] | Restricted Stock [Member] | Tranche Two [Member]      
Related Party Transaction [Line Items]      
Shares of restricted stock vesting percentage   50.00%