Significant Accounting Policies (Details 2)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Revenues | Concentrations of credit risk | Artech
Concentrations of Credit Risk
Percentage of concentration risk	35.00%	46.00%
Revenues | Concentrations of credit risk | Discomed
Concentrations of Credit Risk
Percentage of concentration risk	29.00%	0.00%
Revenues | Concentrations of credit risk | ACIST
Concentrations of Credit Risk
Percentage of concentration risk	9.00%	12.00%
Revenues | RenalGuard
Concentrations of Credit Risk
Percentage of concentration risk	100.00%	82.00%
Gross accounts receivable | Concentrations of credit risk | Artech
Concentrations of Credit Risk
Percentage of concentration risk	73.00%
Gross accounts receivable | Concentrations of credit risk | Discomed
Concentrations of Credit Risk
Percentage of concentration risk	0.00%
Gross accounts receivable | Concentrations of credit risk | ACIST
Concentrations of Credit Risk
Percentage of concentration risk	13.00%