Condensed Statements of Operations and Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue
Total revenue	$ 8,303	$ 5,838	$ 14,209	$ 14,845
Operating expenses
Research and development	20,651	18,271	41,469	34,487
General and administrative	5,063	4,335	10,464	8,939
Litigation settlement	0	0	0	49,954
Total operating expenses	25,714	22,606	51,933	93,380
Loss from operations	(17,411)	(16,768)	(37,724)	(78,535)
Interest income, net	104	62	144	156
Other expense, net	(44)	(58)	(92)	(108)
Net loss	(17,351)	(16,764)	(37,672)	(78,487)
Other comprehensive loss:
Net unrealized gain (loss) on marketable securities	32	16	(9)	(4)
Comprehensive loss	$ (17,319)	$ (16,748)	$ (37,681)	$ (78,491)
Net loss per share, basic	$ (0.53)	$ (0.52)	$ (1.14)	$ (2.45)
Net loss per share, diluted	$ (0.53)	$ (0.52)	$ (1.14)	$ (2.45)
Weighted-average shares used in computing net loss per share, basic	33,036,873	32,505,777	32,958,711	32,044,767
Weighted-average shares used in computing net loss per share, diluted	33,036,873	32,505,777	32,958,711	32,044,767
Collaboration and License
Revenue
Total revenue	$ 8,303	$ 5,838	$ 14,209	$ 14,845