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Effects of Adopting ASU Topic 606, Income Statement Highlights (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement Highlights [Abstract]
Revenue	$ 16	$ 396	$ 22	$ 771
Loss from operations	(6,462)	(3,811)	(14,070)	(7,717)
Interest income, net	12	13	20	31
Loss before taxes	(6,450)	(3,798)	(14,050)	(7,686)
Provision for income taxes	0	0	(5)	(5)
Net loss	(6,450)	$ (3,798)	(14,055)	$ (7,691)
Pre-Topic 606 [Member]
Income Statement Highlights [Abstract]
Revenue	391		772
Loss from operations	(6,087)		(13,320)
Interest income, net	12		20
Loss before taxes	(6,075)		(13,300)
Provision for income taxes			(5)
Net loss	(6,075)		(13,305)
Effects of Adopting Topic 606 [Member] | ASU Topic 606 [Member]
Income Statement Highlights [Abstract]
Revenue	(375)		(750)
Loss from operations	(375)		(750)
Interest income, net	0		0
Loss before taxes	(375)		(750)
Provision for income taxes			0
Net loss	$ (375)		$ (750)

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- Definition

Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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