Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue from Contract with Customer, Including Assessed Tax	$ 0	$ 200	$ 85	$ 818
Operating expenses:
Research and development	22,466	12,409	60,595	33,219
General and administrative	6,960	5,042	22,939	16,136
Total operating expenses	29,426	17,451	83,534	49,355
Operating loss	(29,426)	(17,251)	(83,449)	(48,537)
Other income (expense):
Interest income, net	458	26	650	58
Non-cash interest expense related to sale of future royalties	(325)	(337)	(988)	(1,137)
Foreign exchange loss, net	0	0	(2)	(1)
Loss before income taxes	(29,293)	(17,562)	(83,789)	(49,617)
Provision for income taxes	16	21	51	89
Net loss	$ (29,309)	$ (17,583)	$ (83,840)	$ (49,706)
Net loss per share - basic and diluted (in dollars per share)	$ (0.23)	$ (0.14)	$ (0.66)	$ (0.41)
Shares used to compute net loss per share - basic and diluted (in shares)	126,889,718	123,984,141	126,374,424	120,110,780
Comprehensive loss:
Net loss	$ (29,309)	$ (17,583)	$ (83,840)	$ (49,706)
Unrealized (loss) gain on available-for-sale investments, net of tax	(109)	6	(444)	(3)
Comprehensive loss	(29,418)	(17,577)	(84,284)	(49,709)
Customer Service Contracts [Member]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	13
Non Cash Royalty Revenue [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 0	$ 200	$ 85	$ 805