Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Other Commitments [Line Items]
Deferred rent obligations	$ 3,020	$ 2,355
Unreported loss liability	1,500	1,500
Recoverable insurance amounts	686	626
Property and equipment, net	20,694	$ 18,502
PerClot [Member]
Other Commitments [Line Items]
Prepaid royalties	1,500
Net intangible assets	2,800
Property and equipment, net	1,300
Maximum [Member]
Other Commitments [Line Items]
Estimated loss	$ 2,900
Starch Technology Purchase [Member]
Other Commitments [Line Items]
Term of distribution agreement	15 years
Expected future contingent payment amounts to be initially recorded as research and development expense	$ 1,000
Number of notice days	180 days