Summary of Significant Accounting Policies (Schedule of Revenue Sources that Account for Greater than 10 Percent of Total 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]
Revenue	$ 4,281,235		$ 5,313,914	$ 8,176,169		$ 10,938,105
GlaxoSmithKline LLC [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Revenue	0		502,814	0		502,814
Percent of Total Revenue	0.00%		22.00%	0.00%			[1]
GlaxoSmithKline Biologicals S.A. [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Revenue	392,875		1,176,361	721,155		2,532,745
Percent of Total Revenue		[1]	10.00%		[1]	23.00%
GlaxoSmithKline Entities [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Revenue	392,875		1,679,175	721,155		3,035,559
Percent of Total Revenue		[1]	32.00%		[1]	28.00%
Medicare [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Revenue	$ 1,211,995		$ 1,078,473	$ 2,520,416		$ 2,422,688
Percent of Total Revenue	28.00%		20.00%	31.00%		22.00%

[1] Represents less than 10% of revenue.