Fair value measurements and investments - Schedule of Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets
Short-term investments	$ 19,763	$ 19,496
Fair Value, Measurements, Recurring | Level 1
Assets
Total	19,763	29,367
Fair Value, Measurements, Recurring | Level 1 | US Treasury Securities
Assets
Short-term investments	19,763	19,496
Cash and cash equivalents		9,871
Fair Value, Measurements, Recurring | Level 2
Assets
Total	0	0
Fair Value, Measurements, Recurring | Level 2 | US Treasury Securities
Assets
Short-term investments	0	0
Cash and cash equivalents		0
Fair Value, Measurements, Recurring | Level 3
Assets
Total	0	0
Fair Value, Measurements, Recurring | Level 3 | US Treasury Securities
Assets
Short-term investments	$ 0	0
Cash and cash equivalents		$ 0