Organization and Business (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Future Revenue [Line Items]
Percentage of target institutions of U.S. critical care centers (in hundredths)	10.00%
Amount of advance delayed	$ 20
Minimum [Member]
Future Revenue [Line Items]
Potential revenues in fourth year	10
Maximum [Member]
Future Revenue [Line Items]
Potential revenues in fourth year	$ 20