Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue:
Collaboration and license revenue from related party	$ 49,283	$ 7,173	$ 55,138	$ 15,500
Grant revenue	157	0	310	0
Total revenue	49,440	7,173	55,448	15,500
Operating expenses:
Research and development	18,762	17,624	38,073	32,978
General and administrative	10,292	5,570	19,112	11,071
Total operating expenses	29,054	23,194	57,185	44,049
Income (loss) from operations	20,386	(16,021)	(1,737)	(28,549)
Other income (expense):
Interest income	576	1,418	1,560	2,539
Interest expense	(695)	(547)	(1,243)	(1,089)
Total other income (expense), net	(119)	871	317	1,450
Net income (loss)	$ 20,267	$ (15,150)	$ (1,420)	$ (27,099)
Net income (loss) per common share
Basic	$ 0.32	$ (0.26)	$ (0.02)	$ (0.49)
Diluted	$ 0.29	$ (0.26)	$ (0.02)	$ (0.49)
Shares used to compute net income (loss) per common share
Basic	63,282	58,056	62,289	55,226
Diluted	69,416	58,056	62,289	55,226