Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Accounts receivable, allowance for doubtful accounts	$ 0	$ 36,000
Gamma Knife, accumulated depreciation	1,372,000	2,937,000
Leasehold improvement, accumulated amortization	$ 134,000	$ 807,000
STOCKHOLDERS' EQUITY
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	250,000,000	250,000,000
Common stock, shares issued (in shares)	7,797,185	7,747,185
Common stock, shares outstanding (in shares)	7,797,185	7,747,185