Condensed Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating Expenses:
Research and development	$ 24,258	$ 21,074	$ 45,171	$ 41,398
General and administrative	11,075	12,573	22,944	23,145
Total operating expenses	35,333	33,647	68,115	64,543
Other Income (Expense):
Interest and other income, net	564	290	893	600
Interest expense		(306)		(414)
Total other income (expense), net	564	(16)	893	186
Net Loss	$ (34,769)	$ (33,663)	$ (67,222)	$ (64,357)
Net loss per share, basic	$ (0.52)	$ (0.51)	$ (1.01)	$ (0.97)
Net loss per share, diluted	$ (0.52)	$ (0.51)	$ (1.01)	$ (0.97)
Weighted average number of shares used in computing net loss per share, basic	66,672	66,282	66,639	66,250
Weighted average number of shares used in computing net loss per share, diluted	66,672	66,282	66,639	66,250
Comprehensive Loss:
Net loss	$ (34,769)	$ (33,663)	$ (67,222)	$ (64,357)
Other comprehensive loss:
Unrealized loss on marketable securities and foreign currency	(1,167)	(311)	(6,026)	(439)
Comprehensive Loss	$ (35,936)	$ (33,974)	$ (73,248)	$ (64,796)