CONDENSED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
License fees and royalties	$ 108	$ 131	$ 203	$ 289
Operating expenses:
Research and development	13,613	11,109	35,260	27,149
General and administrative	6,510	4,994	18,590	15,637
Total operating expenses	20,123	16,103	53,850	42,786
Loss from operations	(20,015)	(15,972)	(53,647)	(42,497)
Interest and other income	504	1,021	1,733	3,296
Change in fair value of equity investment	(118)	(195)	109	(195)
Interest and other expense	(22)	(34)	(25)	(82)
Net loss	$ (19,651)	$ (15,180)	$ (51,830)	$ (39,478)
Basic and diluted net loss per share	$ (0.06)	$ (0.08)	$ (0.20)	$ (0.21)
Shares used in computing basic and diluted net loss per share	318,799,174	189,123,647	255,560,779	187,367,621