Property and equipment (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Property and equipment | ||
| Less accumulated depreciation | $ (1,123) | $ (590) |
| Property and equipment, net | 1,690 | 1,816 |
| Depreciation and amortization | 457 | 405 |
| Computer software and equipment | ||
| Property and equipment | ||
| Property and equipment, gross | 15 | 15 |
| Office equipment and furniture | ||
| Property and equipment | ||
| Property and equipment, gross | 176 | 92 |
| Laboratory equipment | ||
| Property and equipment | ||
| Property and equipment, gross | 1,571 | 1,529 |
| Leasehold improvements | ||
| Property and equipment | ||
| Property and equipment, gross | $ 1,051 | 748 |
| Construction in progress | ||
| Property and equipment | ||
| Property and equipment, gross | $ 22 | |