Hemosphere Acquisition (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	May. 16, 2012
Business Acquisition [Line Items]
Fair value of contingent consideration						$ 1,800,000
Gain (loss) on revaluation of contingent consideration	$ 0	$ 198,000	$ 0	$ (296,000)
Contingent consideration liability	$ 0		$ 0		$ 0
Hemosphere [Member]
Business Acquisition [Line Items]
Maximum amount of future consideration payment						$ 4,500,000