Summary of Significant Accounting Policies (Schedule of ResponseDX Revenue) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net revenue	$ 4,092,277	$ 5,403,537	$ 15,030,382	$ 13,220,188
ResponseDX [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net revenue	2,541,512	3,023,616	8,830,087	8,809,603
ResponseDX [Member] | Private Payor [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net revenue	1,584,796	1,795,723	5,450,682	4,814,403
Medicare [Member] | ResponseDX [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net revenue	$ 956,716	$ 1,227,893	$ 3,379,405	$ 3,995,200