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Summary of significant accounting policies (Details Textual) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Dec. 20, 2013
Mar. 31, 2012
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Significant Accounting Policies [Line Items]            
Foreign Currency Transaction Gain (Loss), before Tax     $ 8,100 $ 100 $ 11,500 $ 1,500
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount       3,773,152   3,454,980
Shipping, Handling and Transportation Costs         $ 8,206 $ 5,801
Warrants Issued Against Its Ordinary Shares 9,200,000       9,200,000  
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants     5,399,081 4,273,152 4,607,484 3,954,980
Adjustments to Additional Paid in Capital, Gain Loss on Exercise of Warrants         $ 7,002  
Unit Purchase Option [Member]            
Significant Accounting Policies [Line Items]            
Stock Issued During Period, Value, New Issues   $ 500,100        
Convertible Notes Payable [Member]            
Significant Accounting Policies [Line Items]            
Debt Conversion, Converted Instrument, Warrants or Options Issued 200,000       200,000  
IPO [Member]            
Significant Accounting Policies [Line Items]            
Warrants Issued Against Its Ordinary Shares 4,200,000       4,200,000  
Private Placement [Member]            
Significant Accounting Policies [Line Items]            
Warrants Issued Against Its Ordinary Shares 4,800,000       4,800,000