Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Other Commitments [Line Items]
Sublease income	$ 226	$ 452	$ 910
Unreported loss liability	1,900	1,900	1,700
Recoverable insurance amounts	897	897	693
Property and equipment, net	30,823	30,823	$ 31,028
PerClot [Member]
Other Commitments [Line Items]
Prepaid royalties	1,500	1,500
Net intangible assets	2,200	2,200
Property and equipment, net	1,300	1,300
Maximum [Member]
Other Commitments [Line Items]
Estimated loss	3,700	$ 3,700
Starch Technology Purchase [Member]
Other Commitments [Line Items]
Term of distribution agreement		15 years
Expected future contingent payment amounts	$ 1,000	$ 1,000
Number of notice days		180 days