Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Collaboration and license revenue	$ 33,999	$ 11,050
Operating expenses:
Research and development	17,689	13,004
General and administrative	5,537	5,204
Total operating expenses	23,226	18,208
Operating income (loss)	10,773	(7,158)
Investment income	15	12
Foreign currency transaction, net	28	7
Interest expense	(707)	(711)
Change in fair value of warrant liabilities	18,515	(16,747)
Other income, net	154	0
Net income (loss)	28,778	(24,597)
Other comprehensive income (loss):
Foreign currency translation adjustment	(32)	(6)
Unrealized (losses) on marketable securities	0	(1)
Total comprehensive income (loss)	$ 28,746	$ (24,604)
Net income (loss) per share:
Basic (in dollars per share)	$ 0.23	$ (0.22)
Diluted (in dollars per share)	$ 0.08	$ (0.22)
Weighted average common shares outstanding:
Basic (in shares)	124,232,799	110,742,150
Diluted (in shares)	127,573,485	110,742,150