Prepaid expenses and other current assets - Schedule of Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses	$ 4,732	$ 2,217
Prepaid insurance	2,099	4,265
Pre-contract costs	1,266	546
Total prepaid expenses and other current assets	$ 8,097	$ 7,028