Summary of Significant Accounting Policies (Schedule of ResponseDX Revenue) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net ResponseDX ® revenue	$ 4,281,235	$ 5,313,914	$ 8,176,169	$ 10,938,105
ResponseDX [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net ResponseDX ® revenue	3,681,953	3,106,077	6,999,506	6,288,574
Private Payor [Member] | ResponseDX [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net ResponseDX ® revenue	2,469,958	2,027,604	4,479,090	3,865,886
Medicare [Member] | ResponseDX [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net ResponseDX ® revenue	$ 1,211,995	$ 1,078,473	$ 2,520,416	$ 2,422,688