Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue:
Collaboration revenue - related party	$ (522)	$ 1,493
Type of Revenue [Extensible List]	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember
Total revenue	$ (522)	$ 1,493
Operating expenses:
Research and development expenses	43,969	39,649
General and administrative expenses	22,470	18,571
Collaboration (profit) loss sharing - related party	3,607	(976)
Total operating expenses	70,046	57,244
Loss from operations	(70,568)	(55,751)
Other (expense) income:
Interest income	1,032	384
Interest expense	(1,948)	(912)
Other income (expense)	310	(345)
Total other expense, net	(606)	(873)
Net loss	$ (71,174)	$ (56,624)
Net loss per share attributable to common stockholders, basic	$ (0.57)	$ (0.61)
Net loss per share attributable to common stockholders, diluted	$ (0.57)	$ (0.61)
Weighted average common shares outstanding, basic	125,862,975	92,164,419
Weighted average common shares outstanding, diluted	125,862,975	92,164,419
Other comprehensive income (loss):
Unrealized gain (loss) on investments, net of tax of $0	$ 12	$ (155)
Currency translation adjustment	2	0
Total other comprehensive income (loss)	14	(155)
Comprehensive loss	$ (71,160)	$ (56,779)