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Share capital - Warrants (Details) (USD $) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2014 | Aug. 20, 2013 | Aug. 18, 2013
Class of Warrant or Right [Line Items] |  |  |
Maximum percent of warrants reserved for issuance | 4.00% |  |
Maximum value of warrants reserved for issuance | $ 1,000,000,000 |  |
Exercise price (in dollars per share) | 10.00 |  |
Authorized and issued (in shares) | 4,651,163.000 |  |
Aggregated fair value of warrants | 17,374,000 |  |
Warrants authorized and issued (in shares) |  | 1,003,157 | 3,648,006
Term of warrants | 10 years |  |
Founders |  |  |
Class of Warrant or Right [Line Items] |  |  |
Maximum percent of warrants reserved for issuance | 3.50% |  |
Exercise price (in dollars per share) | 10.00 |  |
Authorized and issued (in shares) | 4,069,768 |  |
Aggregated fair value of warrants | 15,203,000 |  |
Advisor |  |  |
Class of Warrant or Right [Line Items] |  |  |
Maximum percent of warrants reserved for issuance | 0.50% |  |
Exercise price (in dollars per share) | 10.00 |  |
Authorized and issued (in shares) | 581,395 |  |
Aggregated fair value of warrants | $ 2,171,000 |  |

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- Definition Class of Warrant or Right, Outstanding Related to Performance Condition + References No definition available. + Details
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- Definition Class of Warrant or Right, Term + References No definition available. + Details
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- Definition Maximum Percent of Warrants Reserved for Issuance + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 4 -Article 4 + Details
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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + Details
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