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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 |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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