Significant Accounting Policies - Calculation of Net Loss and Number of Shares Used to Compute Basic and Diluted Net Loss per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Loss Earnings Per Share [Line Items]
Net loss-basic and diluted		$ (17,560)	$ (69,956)	$ (34,020)	$ (101,519)
Weighted average shares outstanding-basic		407,848	398,187	407,017	397,997
Weighted average shares outstanding-diluted		407,848	398,187	407,017	397,997
Net loss per share basic	[1]	$ (0.04)	$ (0.18)	$ (0.08)	$ (0.26)
Net loss per share-diluted	[1]	$ (0.04)	$ (0.18)	$ (0.08)	$ (0.26)

[1] Excluding the licensing revenue change in estimate, as discussed in Note 8 - Development, Commercialization and Supply Agreements, net loss per share basic and diluted for the three and six months ended June 30, 2023 would have been $(0.06) and $(0.10), respectively.