Significant Accounting Policies - Calculation of Net Loss and Number of Ordinary Shares and ADSs Used to Compute Basic and Diluted Net Loss per Ordinary Share and ADS (Parenthetical) (Detail) - $ / shares		3 Months Ended		9 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Loss Earnings Per Share [Line Items]
Net loss per share-basic		$ (0.02)	$ (0.06)	$ (0.09)	$ (0.08)
Net loss per share-diluted		(0.02)	(0.06)	(0.09)	(0.08)
American Depositary Share [Member]
Loss Earnings Per Share [Line Items]
Net loss per share-basic	[1]	(0.37)	(1.22)	(1.81)	(1.63)
Net loss per share-diluted	[1]	(0.37)	(1.22)	(1.81)	(1.63)
Common Stock [Member]
Loss Earnings Per Share [Line Items]
Net loss per share-basic	[1]	(0.02)	(0.06)	(0.09)	(0.08)
Net loss per share-diluted	[1]	$ (0.02)	$ (0.06)	$ (0.09)	(0.08)
Exclusion of licensing revenue change in estimate and Medicaid change in estimate | American Depositary Share [Member]
Loss Earnings Per Share [Line Items]
Net loss per share-basic					(1.84)
Net loss per share-diluted					(1.84)
Exclusion of licensing revenue change in estimate and Medicaid change in estimate | Common Stock [Member]
Loss Earnings Per Share [Line Items]
Net loss per share-basic					(0.09)
Net loss per share-diluted					$ (0.09)

[1] Excluding the licensing revenue change in estimates, discussed in Note 7 – Revenue Recognition, net loss per ordinary share, basic and diluted, for the nine months ended September 30, 2024 would have been net loss per share of $(0.09) and net loss per ADS, basic and diluted for the nine months ended September 30, 2024 would have been net loss per share of $(1.84).