Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
License and collaboration revenue	$ 893		$ 18,917
Operating expenses:
Total operating expenses	16,993	$ 13,195	57,446	$ 43,290
Research and development	12,249	9,927	38,419	33,066
General and administrative	3,833	3,268	11,895	10,224
Loss from operations	(16,100)	(13,195)	(38,529)	(43,290)
Interest and other income, net	67	489	1,195	1,722
Net loss	$ (16,033)	$ (12,706)	$ (37,334)	$ (41,568)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.73)	$ (1.06)	$ (2.05)	$ (3.47)
Shares used to compute net loss per share attributable to common stockholders, basic and diluted	22,072,243	12,022,620	18,199,575	11,992,240
License
License and collaboration revenue	$ 32		$ 15,100
Collaboration
License and collaboration revenue	861		3,817
Cost of license
Operating expenses:
Total operating expenses	32		3,102
Cost of collaboration
Operating expenses:
Total operating expenses	$ 879		$ 4,030