CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Property and equipment:
Gamma knife, accumulated depreciation	$ 1,097,000	$ 475,000
Leasehold improvement, accumulated depreciation	$ 510,000	$ 197,000
STOCKHOLDERS' EQUITY
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	25,000,000	25,000,000
Common stock, shares issued (in shares)	7,797,185	7,797,185
Common stock, shares outstanding (in shares)	7,797,185	7,797,185