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Stock incentive plan and stock-based compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 16, 2015
Sep. 27, 2013
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Oct. 08, 2015
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     $ 3 $ 141 $ 3 $ 141  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition         14 days 11 months 5 days  
Stock Issued During Period, Shares, Issued for Services     80,166   296,624    
Stock Issued During Period, Value, Issued for Services     $ 26   $ 141    
Employee Benefits and Share-based Compensation     $ 18 $ 37 $ 82 $ 254  
Subsequent Event [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock Issued During Period, Shares, Issued for Services 30,000            
Stock Issued During Period, Value, Issued for Services $ 10            
Class of Warrant or Right, Exercise Price of Warrants or Rights             $ 0.25
Warrant [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 3.47   $ 3.47    
Class of Warrant or Right, Outstanding     1,020,825   1,020,825    
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          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized   920,000          
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