Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2013

Schedule of ResponseDX Accounts Receivable

ResponseDX^® accounts receivable as of December 31, 2012 and June 30, 2013, consisted of the following:

	December 31, 2012		June 30, 2013
			(Unaudited)
Net Medicare receivable	$	890,936	$	1,930,801
Net Private Payor receivable		2,924,412		3,062,043
		3,815,348		4,992,844
Allowance for doubtful accounts		(991,990)		(903,961)
Total	$	2,823,358	$	4,088,883

Schedule of Estimated Useful Lives of Property and Equipment

Property and equipment are carried at cost less accumulated depreciation and amortization. Depreciation and amortization are calculated using the double declining balance and straight-line methods over the estimated useful lives of the assets. The Company has determined the estimated useful lives of its property and equipment, as follows:

Laboratory equipment	5 to 7 years
Furniture and Equipment	3 to 7 years
Leasehold Improvements	Shorter of the useful life (5 to 7 years) or the lease term

Schedule of ResponseDX Revenue

The following details ResponseDX^® revenue for the periods indicated:

	Three Months				Six Months
	Ended June 30,				Ended June 30,
	(Unaudited)				(Unaudited)
	2012		2013		2012		2013

Net Medicare revenue	$	1,306,989	$	1,078,473	$	2,767,307	$	2,422,688

Net Private Payor revenue		1,526,684		2,027,604		3,012,327		3,865,886

Other		512		-		6,353		-

Net ResponseDX® revenue	$	2,834,185	$	3,106,077	$	5,785,987	$	6,288,574

Schedule of Revenue Sources that Account for Greater than 10 Percent of Total Revenue

Revenue sources that account for greater than 10 percent of total revenue are provided below.

	Three Months Ended June 30,										Six Months Ended June 30,
	2012					2013					2012					2013
	(Unaudited)										(Unaudited)
	Revenue		Percent of Total Revenue			Revenue		Percent of Total Revenue			Revenue		Percent of Total Revenue			Revenue		Percent of Total Revenue

GlaxoSmithKline, LLC and GlaxoSmithKline Biologicals S.A.	$	235,917		6	%	$	1,679,175		32	%	$	955,004		12	%	$	3,035,559		28	%
Medicare, net of contractual allowances	$	1,306,989		34	%	$	1,078,473		20	%	$	2,767,307		35	%	$	2,422,688		22	%

Schedule of Customers that Account for Greater than 10 Percent of Accounts Receivable

Customers that account for greater than 10 percent of gross accounts receivable are provided below.

	As of December 31, 2012					As of June 30, 2013
						(Unaudited)
	Receivable Balance		Percent of Total Receivables			Receivable Balance		Percent of Total Receivables

GlaxoSmithKline, LLC and GlaxoSmithKline Biologicals S.A.	$	1,691,144		27	%	$	1,721,048		23	%
Medicare, net of contractual allowances	$	890,936		14	%	$	1,930,801		26	%