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Organization and basis of presentation (Detail Textuals) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Organization And Basis Of Presentation [Line Items]      
Percentage of outstanding OP units owned 96.60% 96.60%  
Percentage of outstanding OP owned by an unaffiliated holder 3.40% 3.40%  
Issuance of shares (in shares) 2,589,427    
Net proceeds from initial public offering $ 32,000 $ 31,964 $ 51,529
Thetis Asset Management LLC      
Organization And Basis Of Presentation [Line Items]      
Ownership percentage 19.80% 19.80%