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Prepaid expenses and other current assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Prepaid research and development | $ 2,819 | $ 1,898
Prepaid insurance | 2,585 | 1,459
Prepaid licenses | 819 | 665
Interest receivable | 385 | 386
Other | 156 | 90
Total prepaid expenses and other current assets | $ 6,764 | $ 4,498

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