Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue:
Collaboration and license revenue from related party	$ 5,027	$ 10,581	$ 60,165	$ 26,081
Grant revenue	58	0	368	0
Total revenue	5,085	10,581	60,533	26,081
Operating expenses:
Research and development	18,582	18,096	56,655	51,074
General and administrative	10,362	6,116	29,474	17,187
Total operating expenses	28,944	24,212	86,129	68,261
Loss from operations	(23,859)	(13,631)	(25,596)	(42,180)
Other income (expense):
Interest income	499	1,311	2,059	3,850
Interest expense	(700)	(542)	(1,943)	(1,631)
Total other income (expense), net	(201)	769	116	2,219
Net loss	$ (24,060)	$ (12,862)	$ (25,480)	$ (39,961)
Basic and diluted net loss per common share	$ (0.35)	$ (0.22)	$ (0.40)	$ (0.71)
Shares used to compute basic and diluted net loss per common share	68,922	58,205	64,500	56,219