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Fair Value of Financial Instruments (Details Textual) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Cash and cash equivalents $ 7,843 $ 14,625 $ 6,877 $ 9,954
Money Market Accounts [Member]
       
Cash and cash equivalents $ 7,800 $ 11,000