CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating expenses:
Research and development	$ 70,933	$ 53,428
General and administrative	27,277	32,263
Restructuring (note 7)	3,588
Total operating expenses	101,798	85,691
Loss from operations	(101,798)	(85,691)
Other income (expense):
Change in fair value of contingent earn-out liability	1,929	101,774
Change in fair value of warrant liabilities	1,888	3,947
Interest income, net	15,442	182
Other income (expense), net	(12)	514
Total other income, net	19,247	106,417
Net income (loss)	(82,551)	20,726
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	5	7
Unrealized holding gains on short-term investments	227
Comprehensive income (loss), net of tax	$ (82,319)	$ 20,733
Net income (loss) per share - basic (in dollars per share)	$ (0.17)	$ 0.04
Net income (loss) per share - diluted (in dollars per share)	$ (0.17)	$ 0.04
Weighted average common shares outstanding - basic (in shares)	480,010,594	470,627,083
Weighted average common shares outstanding - diluted (in shares)	480,010,594	491,792,152