Commitments And Contingencies (Narrative) (Details) - USD ($)			1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 02, 2014	Sep. 28, 2010	Jan. 31, 2015	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Commitments [Line Items]
Deferred rent obligations					$ 2,355,000	$ 1,735,000
Lease expiration					Dec. 31, 2022
Total rental expense for operating leases					$ 4,300,000	3,400,000	$ 3,000,000
Unreported loss liability					1,500,000	1,400,000
Recoverable insurance amounts					626,000	600,000
Property and equipment, net					18,502,000	$ 11,484,000
PerClot [Member]
Other Commitments [Line Items]
Prepaid royalties					1,500,000
Net intangible assets					2,900,000
Property and equipment, net					$ 1,200,000
Performance Stock Awards (PSAs) [Member]
Other Commitments [Line Items]
Authorized awards from approved stock incentive plans							250,000
Stock Options [Member]
Other Commitments [Line Items]
Grants of stock options					387,000	328,000	562,000
CEO [Member]
Other Commitments [Line Items]
Term of employment agreement					3 years
One-time signing bonus	$ 200,000
CEO [Member] | Performance Stock Awards (PSAs) [Member]
Other Commitments [Line Items]
Authorized awards from approved stock incentive plans	250,000
CEO [Member] | Stock Options [Member]
Other Commitments [Line Items]
Grants of stock options	400,000
Chair Of Board Of Directors [Member]
Other Commitments [Line Items]
Severance payment				$ 1,400,000
Remaining severance obligations					$ 83,000	$ 93,000
Maximum [Member]
Other Commitments [Line Items]
Estimated loss					2,800,000
Starch Technology Purchase [Member]
Other Commitments [Line Items]
Term of distribution agreement		15 years
Amount paid related to achievement of contingent milestone			$ 500,000
Expected future contingent payment amounts to be initially recorded as research and development expense					$ 1,000,000