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Fair value measurement - Changes in Level 3 Liabilities and Contingent Consideration (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2017 | Jun. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2014
Changes in Level 3 liabilities |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ 1,900 | $ 3,763 | $ 3,763 |
(Gains) / losses recognized in profit or loss |  |  |  | 2,675 | (2,270) |  |
Amounts due (presented in Accrued expenses and other current liabilities) |  |  |  | (1,181) |  |  |
Currency translation effects |  |  |  | 254 | 107 |  |
Ending Balance |  |  | $ 3,648 | 3,648 | 1,600 | 1,900 |
Contingent consideration |  |  |  |  |  |  |
Risk-free adjusted discount rate (as a percent) |  | 30.00% |  |  |  |  |
Company's weighted average rate of capital |  | 14.50% |  |  |  |  |
Percentage of future milestones that can be settled with ordinary shares |  |  |  |  |  |  | 100.00%
Percentage of future milestones that can be settled with ordinary shares, reduced rate | 50.00% |  |  |  |  |  |
Increase in fair value of the contingent consideration |  | $ 300 | 2,300 | 2,300 |  |  |
Contingent consideration |  |  |  |  |  |  |
Changes in Level 3 liabilities |  |  |  |  |  |  |
Beginning Balance |  |  |  | 1,838 | 2,926 | 2,926 |
(Gains) / losses recognized in profit or loss |  |  |  | 2,704 | (1,569) |  |
Amounts due (presented in Accrued expenses and other current liabilities) |  |  |  | (1,181) |  |  |
Currency translation effects |  |  |  | 249 | 87 |  |
Ending Balance |  |  | 3,610 | $ 3,610 | 1,444 | $ 1,838 |
Contingent consideration | InoCard |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |
Moving out of all milestones, in months |  |  |  | 6 months |  | 6 months |
Increasing the POS for the first milestone |  |  |  | 20.00% |  | 20.00% |
Decreasing the POS for the first milestone |  |  |  | 20.00% |  | 20.00% |
Reducing the discount rate |  |  |  | 4.50% |  | 20.00% |
Increasing the discount rate |  |  |  | 24.50% |  | 40.00% |
Level 3 Derivative financial instruments |  |  |  |  |  |  |
Changes in Level 3 liabilities |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ 62 | 837 | $ 837 |
(Gains) / losses recognized in profit or loss |  |  |  | (29) | (701) |  |
Currency translation effects |  |  |  | 5 | 20 |  |
Ending Balance |  |  | $ 38 | 38 | $ 156 | 62 |
Delay in milestones by 6 months | Contingent consideration | InoCard |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |
Change in fair value |  |  |  | (231) |  | (209) |
Increasing the POS for the first milestone by 20% | Contingent consideration | InoCard |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |
Change in fair value |  |  |  | 1,103 |  | 367 |
Decreasing the POS for the first milestone by 20% | Contingent consideration | InoCard |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |
Change in fair value |  |  |  | (1,103) |  | (367) |
Reducing the discount rate from 30% to 20% | Contingent consideration | InoCard |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |
Change in fair value |  |  |  | 1,004 |  | 638 |
Increasing the discount rate from 30% to 40% | Contingent consideration | InoCard |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |
Change in fair value |  |  |  | $ (590) |  | $ (309) |

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