Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues:
Total collaboration and license revenues	$ 9,461	$ 1,750
Type of Revenue [Extensible List]	Collaboration	Collaboration
Total collaboration and license revenues	$ 9,461	$ 1,750
Operating expenses:
Research and development (($4,924) and $0 from a related party)	66,387	23,142
General and administrative	15,821	7,008
Total operating expenses	82,208	30,150
Loss from operations	(72,747)	(28,400)
Non-operating income (expense):
Interest and other income, net	154	647
Gain on deemed sale from equity method investee		482
Share of loss from equity method investee		(482)
Total non-operating income, net	154	647
Net loss	(72,593)	(27,753)
Other comprehensive income (loss)	(46)	224
Comprehensive loss	$ (72,639)	$ (27,529)
Net loss per share, basic and diluted	$ (1.08)	$ (0.63)
Weighted-average number of shares used to compute basic and diluted net loss per share	67,082,161	44,282,607