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Condensed Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Condensed Statements of Comprehensive Income [Abstract]    
Net income (loss) $ (408) $ 30
Other comprehensive loss    
Net unrealized losses on marketable securities (3) (32)
Comprehensive loss $ (411) $ (2)