Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2007
Income Tax [Line Items]
Gross federal R&D credit-related deferred tax assets derecognized	$ 26,000,000.0
Unrecognized tax benefit	1,883,000	$ 1,883,000	$ 0
Tax-related penalties or interest recognized	0	0
Uncertain tax positions	0	$ 0
Deferred tax liability	$ 8,300,000
PRC Tax
Income Tax [Line Items]
Statute of limitations due to errors made by taxpayer or withholding agent	3 years
Statute of limitations due to transfer pricing issues	10 years
Statute of limitations due to tax evasion	0 years
PRC Tax | Minimum
Income Tax [Line Items]
Tax year remains open to examination	2019
PRC Tax | Maximum
Income Tax [Line Items]
Tax year remains open to examination	2024
CALIFORNIA
Income Tax [Line Items]
Net operating loss carryforwards	$ 75,200,000
Net operating loss carryforward, derecognized	0
Federal Income Tax
Income Tax [Line Items]
Net operating loss carryforwards	$ 193,400,000			$ 156,500,000
Net operating loss carryforwards expiration year	2037
Net operating loss carryforwards having indefinite life	$ 191,900,000
Tax credit carryforwards available to offset future federal tax liabilities	$ 8,000
Credit carryforward, expire year	2042
Net operating loss carryforward, derecognized	$ 32,900,000
State Income Tax
Income Tax [Line Items]
Net operating loss carryforwards	$ 13,900,000
Net operating loss carryforwards expiration year	2034
Tax credit carryforwards available to offset future federal tax liabilities	$ 7,500,000