Segment Reporting (Schedule of Operating Profit (Loss) by Reporting Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating loss	$ (21,294)	$ (11,304)	$ (36,277)	$ (25,223)
U.S. Medical
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating loss	(20,387)	(9,849)	(33,492)	(22,177)
International Medical
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating loss	$ (907)	$ (1,455)	$ (2,785)	$ (3,046)