Property And Equipment, Net (Schedule Of Property And Equipment, Net) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Equipment, gross	$ 2,966	$ 462
Less: Accumulated depreciation	(331)	(145)
Equipment, net	2,635	317
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Equipment, gross	2,228
Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Equipment, gross	486	425
Software [Member]
Property, Plant and Equipment [Line Items]
Equipment, gross	31	20
Furniture, Fixtures, And Equipment [Member]
Property, Plant and Equipment [Line Items]
Equipment, gross	$ 221	$ 17