Condensed Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Expenses:
Research and development (includes related party amounts of nil and $132 for the three months ended March 31, 2021 and 2020, respectively)	$ 20,324,000	$ 12,575,000
General and administrative (includes related party amounts of nil and $111 for the three months ended March 31, 2021 and 2020, respectively)	10,572,000	7,625,000
Total operating expenses	30,896,000	20,200,000
Other Income (Expense):
Management fee income, related party	8,000	15,000
Interest income, net	302,000	1,119,000
Interest expense	(108,000)	(144,000)
Total other income	202,000	990,000
Net Loss	$ (30,694,000)	$ (19,210,000)
Net loss per share, basic and diluted	$ (0.46)	$ (0.42)
Weighted average number of shares used in computing net loss per share, basic and diluted	66,218	45,411
Comprehensive Loss:
Net loss	$ (30,694,000)	$ (19,210,000)
Other comprehensive income (loss):
Unrealized gain (loss) on marketable securities and foreign currency	(128,000)	230,000
Comprehensive Loss	$ (30,822,000)	$ (18,980,000)