Hemosphere Acquisition (Narrative) (Details) (USD $)	3 Months Ended	0 Months Ended	12 Months Ended
	Mar. 31, 2013	May 16, 2012 Hemosphere [Member]	Dec. 31, 2012 Hemosphere [Member]
Percentage of outstanding equity acquired		100.00%
Cash paid for acquisition		$ 17,000,000
Cash acquired from acquisition		3,200,000
Fair value of contingent consideration		1,800,000
Total purchase price		22,000,000
Maximum amount of future consideration payment		4,500,000
Loss on revaluation of contingent consideration	39,000
Fair value of contingent consideration	2,000,000
Business acquisition, transaction and integration costs			$ 2,400,000