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 (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		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 income - basic		$ (7,738)	$ (25,134)	$ (37,574)	$ (33,565)
Net loss - diluted		$ (7,738)	$ (25,134)	$ (37,574)	$ (33,565)
Weighted average shares outstanding - basic		415,531	411,150	414,607	410,786
Weighted average shares outstanding - diluted		415,531	411,150	414,607	410,786
Loss per share - basic		$ (0.02)	$ (0.06)	$ (0.09)	$ (0.08)
Loss per share - diluted		$ (0.02)	$ (0.06)	$ (0.09)	$ (0.08)
Ordinary Shares
Loss Earnings Per Share [Line Items]
Weighted average shares outstanding - basic		415,531	411,150	414,607	410,786
Weighted average shares outstanding - diluted		415,531	411,150	414,607	410,786
Loss per share - basic	[1]	$ (0.02)	$ (0.06)	$ (0.09)	$ (0.08)
Loss per share - diluted	[1]	$ (0.02)	$ (0.06)	$ (0.09)	$ (0.08)
American Depositary Shares
Loss Earnings Per Share [Line Items]
Weighted average shares outstanding - basic		20,776	20,557	20,730	20,539
Weighted average shares outstanding - diluted		20,776	20,557	20,730	20,539
Loss per share - basic	[1]	$ (0.37)	$ (1.22)	$ (1.81)	$ (1.63)
Loss per share - diluted	[1]	$ (0.37)	$ (1.22)	$ (1.81)	$ (1.63)

[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).