CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenues:
Royalties	$ 123	$ 137
Operating expenses:
Research and development	22,099	21,113
General and administrative	6,699	7,478
Total operating expenses	28,798	28,591
Loss from operations	(28,675)	(28,454)
Interest income	112	173
Interest expense	(1,479)	(743)
Other income and (expense), net	(56)	1,200
Net loss	$ (30,098)	$ (27,824)
Basic and diluted net loss per share	$ (0.09)	$ (0.09)
Shares used in computing basic and diluted net loss per share	332,066,889	323,638,696