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Fair value measurement - Changes in Level 3 items (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Changes in Level 3 liabilities
Beginning Balance	$ 1,400
Ending Balance	3,300
Contingent consideration
Fair value of derivative financial instruments	3,300
Level 3 | Derivative financial instruments
Changes in Level 3 liabilities
Beginning Balance	1,375
Losses recognized in profit or loss	2,634
Exercise of warrants	(770)
Currency translation effects	12
Ending Balance	3,251
Contingent consideration
Fair value of derivative financial instruments	$ 1,375

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- Definition

Currency translation effects to financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

No definition available.

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- Definition

Amount of warrants exercised classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

No definition available.

+ Details

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- References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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