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Line of credit (Details Textual) (USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2014
Venture Champion Asia Limited [Member]
Sep. 30, 2014
Venture Champion Asia Limited [Member]
Credit Agreement Warrant [Member]
Line of Credit Facility [Line Items]            
Line of cerdit, initiation day         May 06, 2014  
Line of credit facility, description         Credit Agreement  
Line of credit facility, unsecured indebtedness, current amount         $ 2,000  
Line of credit facility, unsecured indebtedness, maximum amount         2,352  
Line of credit facility period         18 months  
Conversion price         $ 0.0275  
Original issue discount, percentage         15.00%  
Number of common shares callable by warrants         10,909 655
Warrant coverage, maximum percentage         50.00%  
Exercise price $ 0.0286 $ 0.0289 $ 0.0252 $ 0.0269   $ 0.0275
Expected term           3 years
Fair value of warrants booked as interest expense at period end           $ 258