Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue
Collaborations, milestones, and royalties	$ 30,175	$ 67,447	$ 115,670	$ 101,412
Operating expenses
Research and development	47,084	49,497	94,839	90,908
General and administrative	11,091	8,863	22,364	17,090
Total operating expenses	58,175	58,360	117,203	107,998
Income (loss) from operations	(28,000)	9,087	(1,533)	(6,586)
Other income (expenses)
Interest income, net	717	147	1,371	362
Other expense, net	(147)	(6)	(244)	(17)
(Loss) gain on equity securities, net	(6,545)	43,020	(9,974)	56,002
Total other income (expense), net	(5,975)	43,161	(8,847)	56,347
Net income (loss)	(33,975)	52,248	(10,380)	49,761
Other comprehensive loss
Net unrealized loss on marketable debt securities	(1,823)	(112)	(7,435)	(90)
Comprehensive income (loss)	$ (35,798)	$ 52,136	$ (17,815)	$ 49,671
Net income (loss) per share attributable to common stockholders:
Basic net income (loss) per common share (in dollars per share)	$ (0.57)	$ 0.90	$ (0.17)	$ 0.86
Diluted net income (loss) per common share (in dollars per share)	$ (0.57)	$ 0.87	$ (0.17)	$ 0.82
Weighted average shares used to compute net income (loss) per share attributable to common stockholders:
Basic (in shares)	59,567,139	58,247,941	59,487,924	58,123,319
Diluted (in shares)	59,567,139	60,335,339	59,487,924	60,503,846