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Fair value measurement - Changes in Level 3 Liabilities and Contingent Consideration (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 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	95	(257)
Currency translation effects	28	157
Ending Balance	2,023	3,663	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	124	60
Currency translation effects	27	127
Ending Balance	$ 1,989	3,113	$ 1,838
Contingent consideration | InoCard
Contingent consideration
Discount rate (as a percent)			30.00%
The number of months moving out of all milestones	6 months
Increase Probability of Success	20.00%
Decrease Probability Of Success	20.00%
Sensitivity down of the discount rate	20.00%
Sensitivity up of the discount rate	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	(29)	(317)
Currency translation effects	1	30
Ending Balance	34	$ 550	62
Delay in milestones by 6 months | Contingent consideration | InoCard
Contingent consideration
Change in fair value	(226)		(209)
Increasing the POS for the first milestone by 20% | Contingent consideration | InoCard
Contingent consideration
Change in fair value	398		367
Decreasing the POS for the first milestone by 20% | Contingent consideration | InoCard
Contingent consideration
Change in fair value	(398)		(367)
Reducing the discount rate from 30% to 20% | Contingent consideration | InoCard
Contingent consideration
Change in fair value	636		638
Increasing the discount rate from 30% to 40% | Contingent consideration | InoCard
Contingent consideration
Change in fair value	$ (305)		$ (309)

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- Definition

Represents the fair value decrease probability of success.

+ References

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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

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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

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- Definition

Represents the fair value increase probability of success.

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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

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- Definition

Represents the number of months moving out of all milestones.

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- Definition

Pertains to the fair value of the contingent consideration.

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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.

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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
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-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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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
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-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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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.

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-Section 50
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-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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