Income taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Net operating loss carryforwards	$ 17,430	$ 21,935
Liability to licensor	4,159	4,159
Goodwill	3,193	3,449
Lease liability	836	1,128
Accrued compensation	659	485
Research credit carryforwards	5,760	2,945
Section 174 cost capitalization	14,523	0
Section 59(e) cost capitalization	9,450	0
Stock-based compensation	1,628	697
Other	3	2
Gross deferred tax assets	57,641	34,800
Less valuation allowance	(56,706)	(33,351)
Total deferred tax assets	935	1,449
Deferred tax liabilities:
Fixed assets	(426)	(756)
Operating lease right-of-use asset	(509)	(693)
Total deferred tax liabilities	(935)	(1,449)
Net deferred tax assets	$ 0	$ 0