Gamma Knife at NYU Medical Center (Details) (USD $)	6 Months Ended
	Jun. 30, 2012
Gamma Knife at NYU Medical Center [Abstract]
Net cost of the gamma knife	$ 3,593,000
Construction costs for installation and upgradation of gamma knife	251,000
Extended term of arrangement with NYU	12 years
Lease payments period	81 months
Lease periodic payments	61,000
Additional lease periodic payments	$ 2,379