Income taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Net operating loss carryforwards	$ 25,034	$ 17,430
Liability to licensor	4,159	4,159
Goodwill	2,938	3,193
Lease liability	517	836
Accrued compensation	746	659
Research credit carryforwards	10,379	5,760
Section 174 cost capitalization	31,220	14,523
Section 59(e) cost capitalization	8,400	9,450
Stock-based compensation	2,790	1,628
Other	4	3
Gross deferred tax assets	86,187	57,641
Less valuation allowance	(85,642)	(56,706)
Total deferred tax assets	545	935
Deferred tax liabilities:
Fixed assets	(231)	(426)
Operating lease right-of-use asset	(314)	(509)
Total deferred tax liabilities	(545)	(935)
Net deferred tax assets	$ 0	$ 0