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Stock incentive plan and stock-based compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Apr. 13, 2016
Sep. 27, 2013
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage Of Stockholder Incentive Stock Option Granted On Date Of Grant     10.00%  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized     $ 0 $ 101
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     0 years 7 months 28 days
Stock Issued During Period, Value, Issued for Services     $ 161 $ 159
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 0.25  
Employee Benefits and Share-based Compensation     $ 130 $ 290
Subsequent Event [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Issued During Period, Shares, Issued for Services 170,000      
Stock Issued During Period, Value, Issued for Services $ 51      
Warrant [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 1.11  
Class of Warrant or Right, Outstanding     3,820,825  
Stock Incentive Plan 2012 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   415,000 1,335,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized   920,000 1,665,000  
Amended And Restated Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   1,335,000 3,000,000