Fair value measurement - Changes in Level 3 Liabilities and Contingent Consideration (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Changes in Level 3 liabilities
Beginning Balance	$ 1,900	$ 3,763	$ 3,763
(Gain) Loss recorded due to changes in fair value of derivative liability	384	(393)
Currency translation effects	168	75
Ending Balance	2,452	3,445	1,900
Contingent consideration
Changes in Level 3 liabilities
Beginning Balance	1,838	2,926	2,926
(Gain) Loss recorded due to changes in fair value of derivative liability	415	254
Currency translation effects	162	57
Ending Balance	$ 2,415	3,237	$ 1,838
Contingent consideration \| InoCard
Contingent consideration
Discount rate (as a percent)	14.50%		30.00%
Change in fair value	$ 300		$ 300
The number of months moving out of all milestones	6 months		6 months
Increase Probability of Success	20.00%		20.00%
Decrease Probability Of Success	20.00%		20.00%
Sensitivity down of the discount rate	10.00%		20.00%
Sensitivity up of the discount rate	20.00%		40.00%
Level 3 Derivative financial instruments
Changes in Level 3 liabilities
Beginning Balance	$ 62	837	$ 837
(Gain) Loss recorded due to changes in fair value of derivative liability	(31)	(647)
Currency translation effects	6	18
Ending Balance	37	$ 208	62
Delay in milestones by 6 months \| Contingent consideration \| InoCard
Contingent consideration
Change in fair value	(152)		(209)
Increasing the POS for the first milestone by 20% \| Contingent consideration \| InoCard
Contingent consideration
Change in fair value	792		367
Decreasing the POS for the first milestone by 20% \| Contingent consideration \| InoCard
Contingent consideration
Change in fair value	(792)		(367)
Reducing the discount rate from 30% to 20% \| Contingent consideration \| InoCard
Contingent consideration
Change in fair value	312		638
Increasing the discount rate from 30% to 40% \| Contingent consideration \| InoCard
Contingent consideration
Change in fair value	$ (282)		$ (309)

Represents the fair value decrease probability of success.

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value sensitivity down.

+ References

No definition available.

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value sensitivity up.

+ References

No definition available.

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Represents the fair value increase probability of success.

+ References

No definition available.

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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

Represents the number of months moving out of all milestones.

+ References

No definition available.

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- Definition

Pertains to the fair value of the contingent consideration.

+ References

No definition available.

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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

+ References

No definition available.

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- Definition

Amount of gain (loss) recognized on the income statement for 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Amount of increase (decrease) 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66048111&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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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