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Stockholders' equity (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Nonvested options, unrecognized share-based compensation costs $ 1,349 $ 281
Nonvested options, weighted average period for recognition of unrecognized share-based compensation costs 1 year 7 months 6 days 1 year 6 months
Intrinsic value of options exercised 32 0
Proceeds from exercise of options 8 0
Weight average fair value of options granted $ 2.17 $ 0.22
Reversal of compensation costs, unvested options   276
Fair value of options vested $ 444 $ 1,924
Stock Option Plan 2001 Amended 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 1,400,000  
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum 10.00%