Quarterly report pursuant to Section 13 or 15(d)

Marketable securities (Details)

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Marketable securities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Marketable securities    
Cost $ 0 $ 4,422
Market value   4,411
Unrealized (loss)   (11)
Cost of investments by fiscal maturity    
Due in one year or less   4,422
Estimated fair value of investments by fiscal maturity    
Due in one year or less   4,411
Certificates of deposit
   
Marketable securities    
Cost   4,422
Market value   4,411
Unrealized (loss)   $ (11)