Summary of significant accounting policies - Property and equipment (Details) |
12 Months Ended |
|---|---|
Dec. 31, 2019 | |
| Laboratory equipment | |
| Property and equipment | |
| Estimated useful life | 5 years |
| Furniture and office equipment | |
| Property and equipment | |
| Estimated useful life | 5 years |
| Computer hardware and software | Minimum | |
| Property and equipment | |
| Estimated useful life | 3 years |
| Computer hardware and software | Maximum | |
| Property and equipment | |
| Estimated useful life | 5 years |
| Internally developed software | Minimum | |
| Property and equipment | |
| Estimated useful life | 3 years |
| Internally developed software | Maximum | |
| Property and equipment | |
| Estimated useful life | 5 years |