Summary of Significant Accounting Policies (Schedule of ResponseDX Revenue) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net Revenue	$ 5,624,191	$ 3,981,644
Medicare [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net Revenue	1,376,900	1,460,318
ResponseDX [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net Revenue	3,182,498	2,951,802
ResponseDX [Member] | Medicare [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net Revenue	1,344,215	1,460,318
ResponseDX [Member] | Private Payor [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net Revenue	1,838,283	1,485,643
ResponseDX [Member] | Other Payor [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net Revenue		$ 5,841