Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Assets	$ 18,114		$ 18,114		$ 17,770
Property & equipment, net	1,576		1,576		1,557
Intangible assets	10,518		10,518		10,518
Revenues	1,277	$ 2,816	3,168	$ 4,947
Net income (loss)	(1,625)	(202)	(2,580)	(824)
UNITED STATES
Segment Reporting Information [Line Items]
Assets	11,819		11,819		11,268
Property & equipment, net	60		60		68
Intangible assets	10,518		10,518		10,518
POLAND
Segment Reporting Information [Line Items]
Assets	114		114		238
Property & equipment, net	0		0		2
Intangible assets	0		0		0
country:DE
Segment Reporting Information [Line Items]
Assets					6,264
Property & equipment, net					1,487
Intangible assets					$ 0
UNITED STATES
Segment Reporting Information [Line Items]
Revenues	174	279	424	553
Net income (loss)	(667)	(487)	(1,237)	(977)
POLAND
Segment Reporting Information [Line Items]
Revenues	5	3	13	18
Net income (loss)	(37)	(48)	(206)	(91)
GERMANY
Segment Reporting Information [Line Items]
Assets	6,181		6,181
Property & equipment, net	1,516		1,516
Intangible assets	0		0
Revenues	1,098	2,534	2,731	4,376
Net income (loss)	$ (921)	$ 333	$ (1,137)	$ 244