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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

X

- Definition

The fair value of the derivative asset if there is an extension of the exercise dates by one year

+ References

No definition available.

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- Definition

The fair value of the derivative asset if there is an increase in the volatility rate by ten percentage-points to eighty-five percentage points.

+ References

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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)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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