Property And Equipment, Net (Schedule Of Property And Equipment, Net) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Equipment, gross	$ 3,210	$ 3,165
Less: Accumulated depreciation	(1,154)	(992)
Equipment, net	2,056	2,173
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Equipment, gross	2,248	2,248
Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Equipment, gross	589	518
Furniture, Fixtures, And Equipment [Member]
Property, Plant and Equipment [Line Items]
Equipment, gross	$ 256	248
Software [Member]
Property, Plant and Equipment [Line Items]
Equipment, gross		$ 33