Condensed Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating Expenses:
Research and development	$ 20,913	$ 20,324
General and administrative	11,869	10,572
Total operating expenses	32,782	30,896
Other Income (Expense):
Interest and other income, net	329	310
Interest expense		(108)
Total other income, net	329	202
Net Loss	$ (32,453)	$ (30,694)
Net loss per share, basic and diluted	$ (0.49)	$ (0.46)
Weighted average number of shares used in computing net loss per share, basic and diluted	66,607	66,218
Comprehensive Loss:
Net loss	$ (32,453)	$ (30,694)
Other comprehensive loss:
Unrealized loss on marketable securities and foreign currency	(4,859)	(128)
Comprehensive Loss	$ (37,312)	$ (30,822)