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Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 132 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Schedule of Marketable Securities [Line Items]        
Cost $ 510 $ 663   $ 663
Unrealized gain (loss) (59) 2   2
Write-down (275) (39) (158) (1,234)
Fair value 176 626   626
Equity Securities [Member]
        
Schedule of Marketable Securities [Line Items]        
Cost 510 663   663
Unrealized gain (loss) (59) 2   2
Write-down (275) (39)    
Fair value $ 176 $ 626   $ 626