ResponseDX Accounts Receivable (Detail) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts - Medicare	$ (607,858)	$ (838,750)
Net ResponseDX accounts receivable	4,022,555	4,047,059
Net Medicare revenue
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net ResponseDX accounts receivable	750,507	506,308
ResponseDX
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	3,372,887	3,183,972
Net ResponseDX accounts receivable	2,765,029	2,345,222
ResponseDX | Net Medicare revenue
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	750,507	506,308
Allowance for doubtful accounts - Medicare	(607,858)	(838,750)
ResponseDX | Private Payor Revenue
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	2,622,380	2,634,838
ResponseDX | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable		$ 42,826