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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% |

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