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Nature of business, basis of presentation and summary of significant accounting policies (Details Textual) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and Cash Equivalents, at Carrying Value $ 1,289us-gaap_CashAndCashEquivalentsAtCarryingValue $ 775us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,147us-gaap_CashAndCashEquivalentsAtCarryingValue $ 945us-gaap_CashAndCashEquivalentsAtCarryingValue
Accumulated deficit $ (124,202)us-gaap_RetainedEarningsAccumulatedDeficit $ (123,199)us-gaap_RetainedEarningsAccumulatedDeficit