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Segment reporting - Schedule of Disaggregated Segment Operating Expenses on Functional Basis (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting [Abstract]    
Revenue $ 14,170 $ 16,661
Cost of revenue 7,115 8,155
Gross profit 7,055 8,506
Operating expenses:    
Compensation expenses 36,774 41,278
Stock-based compensation 28,207 34,425
Professional expenses 15,032 9,423
Business expenses 9,852 11,997
Facility expenses 6,379 5,500
Depreciation and amortization 5,836 5,352
Other 5,076 3,994
Total operating expenses 107,156 111,969
Interest income 16,666 17,764
Loss on equity method investment (2,649) 0
Other expense (417) (578)
Provision for income taxes 98 0
Net loss $ (86,599) $ (86,277)