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Segment Information (Details Textual)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment Information (Textual)
Number of reportable segments			1
Percentage of total assets	100.00%	100.00%	100.00%	100.00%
Sweden [Member]
Segment Information (Textual)
Percentage of total assets			54.00%		71.00%
United States [Member]
Segment Information (Textual)
Percentage of total assets			45.00%		28.00%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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