Segment Reporting (Schedule of Operating Profit (Loss) by Reporting Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating loss	$ (14,983)	$ (13,919)
U.S. Medical
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating loss	(13,105)	(12,328)
International Medical
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating loss	$ (1,878)	$ (1,591)