Geographic and customer concentrations - Schedule of long-lived assets by geographic area (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Long-lived Assets [Line Items]
Total long-lived assets	$ 3,642	$ 2,856
United States
Long-lived Assets [Line Items]
Total long-lived assets	3,187	2,728
Australia
Long-lived Assets [Line Items]
Total long-lived assets	7	3
India
Long-lived Assets [Line Items]
Total long-lived assets	441	113
All Other
Long-lived Assets [Line Items]
Total long-lived assets	$ 7	$ 12