Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue:
Collaboration and license revenue from related party	$ 1,699	$ 49,283	$ 11,922	$ 55,138
Grant revenue	114	157	244	310
Total revenue	1,813	49,440	12,166	55,448
Operating expenses:
Research and development	20,853	18,762	44,271	38,073
General and administrative	19,698	10,292	35,960	19,112
Total operating expenses	40,551	29,054	80,231	57,185
Income (loss) from operations	(38,738)	20,386	(68,065)	(1,737)
Other income (expense):
Interest income	224	576	529	1,560
Interest expense	(695)	(695)	(1,384)	(1,243)
Total other income (expense), net	(471)	(119)	(855)	317
Net income (loss)	$ (39,209)	$ 20,267	$ (68,920)	$ (1,420)
Net income (loss) per common share
Basic	$ (0.56)	$ 0.32	$ (0.99)	$ (0.02)
Diluted	$ (0.56)	$ 0.29	$ (0.99)	$ (0.02)
Shares used to compute net income (loss) per common share
Basic	69,788	63,282	69,698	62,289
Diluted	69,788	69,416	69,698	62,289