Summary of Significant Accounting Policies (Schedule of ResponseDX Revenue) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net ResponseDX ® revenue	$ 3,790,604	$ 3,894,934
ResponseDX [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net ResponseDX ® revenue	3,328,511	3,317,553
Private Payor [Member] | ResponseDX [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net ResponseDX ® revenue	1,920,270	2,009,131
Medicare [Member] | ResponseDX [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net ResponseDX ® revenue	$ 1,408,241	$ 1,308,422