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Fair value measurement - BMS warrants (Details) - USD ($) $ in Thousands | 2 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 12, 2015 | Aug. 07, 2015 | Dec. 31, 2016 | Dec. 31, 2015
BMS Warrants |  |  |  |
Fair value measurements |  |  |  |
Gain (Loss) recorded due to changes in fair value of derivative asset | $ (7,300) | $ (300) |  |
Recurring | Fair value hierarchy Level 3 | BMS Warrants |  |  |  |
Fair value measurements |  |  |  |
Fair value of derivative asset |  |  | $ 100 | $ 600
Recurring | Fair value hierarchy Level 3 | BMS Warrants | Other nonoperating income (expense) |  |  |  |
Fair value measurements |  |  |  |
Gain (Loss) recorded due to changes in fair value of derivative asset |  |  | 500 | $ 500
Recurring | Fair value hierarchy Level 3 | BMS Warrants | Monte-Carlo |  |  |  |
Fair value measurements |  |  |  |
Fair value of derivative asset |  |  | 51 |
Fair value of derivative asset if increase volatility by ten percentage-points to eighty-five percentage points |  |  | 90 |
Fair value of derivative asset if extend exercise dates by one year |  |  | $ 80 |
Recurring | Fair value hierarchy Level 3 | BMS Warrants | Monte-Carlo | Minimum |  |  |  |
Fair value measurements |  |  |  |
Expected term before exercise |  |  | 3 years |
Recurring | Fair value hierarchy Level 3 | BMS Warrants | Monte-Carlo | Maximum |  |  |  |
Fair value measurements |  |  |  |
Expected term before exercise |  |  | 5 years |
Recurring | Fair value hierarchy Level 3 | BMS 7th Warrant | Monte-Carlo |  |  |  |
Fair value measurements |  |  |  |
Fair value of derivative asset |  |  | $ 21 |
Fair value of derivative asset if increase volatility by ten percentage-points to eighty-five percentage points |  |  | 41 |
Fair value of derivative asset if extend exercise dates by one year |  |  | 42 |
Recurring | Fair value hierarchy Level 3 | BMS 10thWarrant | Monte-Carlo |  |  |  |
Fair value measurements |  |  |  |
Fair value of derivative asset |  |  | 30 |
Fair value of derivative asset if increase volatility by ten percentage-points to eighty-five percentage points |  |  | 49 |
Fair value of derivative asset if extend exercise dates by one year |  |  | $ 38 |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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