Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Collaboration and license revenue	$ 1,828	$ 2,697
Operating expenses:
Research and development	50,883	26,252
General and administrative	11,404	7,868
Change in fair value of contingent consideration and contingent value rights liabilities	526	(1,038)
Amortization of intangible assets	433	429
Total operating expenses	63,246	33,511
Loss from operations	(61,418)	(30,814)
Investment and other income (expense), net	3,102	(95)
Loss before income taxes and equity method investment loss	(58,316)	(30,909)
Equity method investment loss	(1,861)	(775)
Net loss	$ (60,177)	$ (31,684)
Net loss per share attributable to common stockholders, basic	$ (0.85)	$ (0.54)
Net loss per share attributable to common stockholders, diluted	$ (0.85)	$ (0.54)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic	70,703	58,340
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted	70,703	58,340
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax of $0	$ 470	$ 107
Unrealized gain (loss) on marketable debt securities, net of tax of $0	983	(1,589)
Total other comprehensive income (loss)	1,453	(1,482)
Comprehensive loss	$ (58,724)	$ (33,166)