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Nature of business, basis of presentation and summary of significant accounting policies (Details Textual) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and Cash Equivalents, at Carrying Value $ 415 $ 945 $ 406 $ 486
Accumulated deficit $ (121,410) $ (119,184)