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Summary of Significant Accounting Policies - Business Overview (Details)
ft² in Thousands, $ in Thousands
1 Months Ended 9 Months Ended
May. 31, 2015
USD ($)
shares
Sep. 30, 2015
USD ($)
ft²
state
real_estate_property
shares
Dec. 31, 2014
shares
Jun. 03, 2015
USD ($)
Accounting Policies [Abstract]        
General partner ownership   100.00%    
Value of real estate property investments and mortgages   $ 111,990    
Number of real estate properties | real_estate_property   33    
Number of states in which real estate investments are in | state   16    
Area of real estate property (in square feet) | ft²   575    
Subsidiary, Sale of Stock [Line Items]        
Shares of common stock issued | shares   7,311,183 200,000  
Net proceeds from initial public offering $ 125,200      
Net proceeds from private placement $ 2,300      
IPO [Member]        
Subsidiary, Sale of Stock [Line Items]        
Shares of common stock issued | shares 7,187,500      
Private Placement [Member]        
Subsidiary, Sale of Stock [Line Items]        
Shares of common stock issued | shares 123,683      
Senior Revolving Credit Facility [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]        
Subsidiary, Sale of Stock [Line Items]        
Maximum borrowing capacity       $ 75,000