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Condensed Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Condensed Statements of Comprehensive Income [Abstract]        
Net loss $ (130) $ (1,200) $ (101) $ (1,407)
Other comprehensive loss        
Net unrealized losses on marketable securities (53) (74) (85) (131)
Comprehensive loss $ (183) $ (1,274) $ (186) $ (1,538)