BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
BALANCE SHEETS
Property and equipment, net of accumulated depreciation	$ 362	$ 356
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	14,261,897	14,036,985
Common stock, shares outstanding	14,232,666	14,007,754
Treasury stock, shares	29,231,000	29,231,000