Prepaid expenses and other current assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
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