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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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Represents percentage of outstanding operating partnership units owned.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Number of new stock issued during the period.

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Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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