Fair value measurements (Details) - Recurring - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair value measurements
Total Assets	$ 42,250	$ 55,865
Money market funds, included in cash and cash equivalents
Fair value measurements
Money market funds	42,071	55,686
Money market funds, included in restricted cash
Fair value measurements
Money market funds	179	179
Level 1
Fair value measurements
Total Assets	42,250	55,865
Level 1 | Money market funds, included in cash and cash equivalents
Fair value measurements
Money market funds	42,071	55,686
Level 1 | Money market funds, included in restricted cash
Fair value measurements
Money market funds	$ 179	$ 179