Significant Accounting Policies - Calculation of Net (Loss) Income and Number of Ordinary Shares and ADSs Used to Compute Basic and Diluted Net (Loss) Earnings per Ordinary Share and ADS (Parenthetical) (Detail) - $ / shares		3 Months Ended		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Loss Earnings Per Share [Line Items]
Net loss per share-basic		$ (0.03)	$ 0	$ (0.07)	$ (0.02)
Net loss per share-diluted		(0.03)	0	(0.07)	(0.02)
American Depositary Share [Member]
Loss Earnings Per Share [Line Items]
Net loss per share-basic	[1]	(0.68)	0.07	(1.44)	(0.41)
Net loss per share-diluted	[1]	(0.68)	0.07	(1.44)	(0.41)
Common Stock [Member]
Loss Earnings Per Share [Line Items]
Net loss per share-basic	[1]	(0.03)	0	(0.07)	(0.02)
Net loss per share-diluted	[1]	$ (0.03)	0	$ (0.07)	(0.02)
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			(0.13)		(0.61)
Net loss per share-diluted			(0.13)		(0.61)
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			(0.01)		(0.03)
Net loss per share-diluted			$ (0.01)		$ (0.03)

[1] Excluding the licensing revenue change in estimates, discussed in Note 7 – Revenue Recognition, net earnings (loss) per ordinary share, basic and diluted, for the three and six months ended June 30, 2024 would have been net loss per share of $(0.01) and $(0.03), respectively and net earnings (loss) per ADS, basic and diluted for the three and six months ended June 30, 2024 would have been net loss per share of $(0.13) and $(0.61), respectively.