Summary of Significant Accounting Policies (Schedule of ResponseDX Revenue) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net ResponseDX ® revenue	$ 4,464,991	$ 4,092,277	$ 12,641,160	$ 15,030,382
ResponseDX [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net ResponseDX ® revenue	3,917,585	2,541,512	10,917,091	8,830,087
Private Payor [Member] | ResponseDX [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net ResponseDX ® revenue	3,059,799	1,584,796	7,538,888	5,450,682
Medicare [Member] | ResponseDX [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Net ResponseDX ® revenue	$ 857,786	$ 956,716	$ 3,378,203	$ 3,379,405