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Investment in Surface Pharmaceuticals, Inc. and Agreements - Related Party Transactions - Schedule of Condensed Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues, net	$ 12,290	$ 8,865
Loss from operations	(556)	(1,781)
Net income (loss)	11,358	$ (3,513)
Surface Pharmaceuticals Inc [Member]
Revenues, net
Loss from operations	812
Net income (loss)	$ (812)

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