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Summary of accounting policies applied by the Group for the annual reporting period ending December 31, 2020 (Tables) | 12 Months Ended
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Dec. 31, 2020
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Summary of estimated Useful Lives of Property, Plant and Equipment | The estimated useful lives are generally within the following ranges:
Category |  | Estimated useful life
Computer equipment |  | 1 – 10 years
Laboratory equipment |  | 1 – 15 years
Office equipment |  | 2 – 20 years
Summary of useful life of intangible assets other than goodwill | Amortization is calculated on a straight-line basis over the estimated useful lives of the assets as follows:
Category |  | Estimated useful life
Licenses |  | 5 – 30 years
Software |  | 1 – 5 years
Summary of foreign exchange rates | The Group used the following exchange rates to convert the financial statements of its U.S. subsidiary:
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | Year-end rate |  |  | Average rate |  |  | Year-end rate |  |  | Average rate |  |  | Year-end rate |  |  | Average rate |
Euros per U.S. Dollar |  |  | 0.8149 |  |  |  | 0.8762 |  |  |  | 0.8902 |  |  |  | 0.8932 |  |  |  | 0.8738 |  |  |  | 0.8468 |

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