Hemosphere Acquisition (Narrative) (Details) - USD ($)		12 Months Ended
	May. 16, 2012	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Fair value of contingent consideration	$ 1,800,000		$ 0
Gain (loss) on revaluation of contingent consideration		$ 0	1,900,000	$ 28,000
Contingent consideration liability		0	$ 0
Business combination, integration costs		$ 2,800,000
Hemosphere [Member]
Business Acquisition [Line Items]
Total purchase price	22,000,000
Cash acquired from acquisition	3,200,000
Maximum amount of future consideration payment	$ 4,500,000