Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Collaboration and license revenue	$ 5,249	$ 39,273	$ 11,187	$ 73,272
Operating expenses:
Research and development	17,782	19,182	36,406	36,871
General and administrative	6,105	6,231	11,800	11,768
Total operating expenses	23,887	25,413	48,206	48,639
Operating (loss) income	(18,638)	13,860	(37,019)	24,633
Investment income	1,394	207	2,725	222
Foreign currency transaction, net	23	(104)	42	(76)
Interest expense	(752)	(715)	(1,560)	(1,422)
Change in fair value of warrant liabilities	6,341	(4,647)	2,262	13,868
Other income, net	245	0	500	154
Net (loss) income	(11,387)	8,601	(33,050)	37,379
Other comprehensive income (loss):
Foreign currency translation adjustment	(27)	118	(49)	86
Unrealized gain on marketable securities	0	0	11	0
Total comprehensive income (loss)	$ (11,414)	$ 8,719	$ (33,088)	$ 37,465
Net (loss) income per share:
Basic (in dollars per share)	$ (0.07)	$ 0.06	$ (0.22)	$ 0.27
Diluted (in dollars per share)	$ (0.07)	$ 0.06	$ (0.22)	$ 0.17
Weighted average common shares outstanding:
Basic (in shares)	153,442,413	148,505,729	153,396,380	136,436,316
Diluted (in shares)	153,442,413	148,505,729	153,396,380	136,966,312