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Equity Equity - Cumulative Offering Costs (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]      
Due from Affiliates $ (1,128) $ (686) $ 0
Contingent Advisor Payment Holdback - Organization and Offering Expenses [Member]      
Class of Stock [Line Items]      
Cumulative Offering Costs Private and Public Offerings 2,806 1,698  
Cumulative Organizational Costs Private and Public Offerings 510 359  
Organizational and Offering Costs Previously Advanced by Advisor 1,998 1,226  
Payment of Offering and Organizational Cost 1,318 831  
Due to Affiliate   (999)  
Due from Affiliates   (677)  
Organizational and Offering Costs Incurred, Net of Advisor Advances, Net Due 1,496 $ 381  
Costs in Excess of Limit $ 1,820