Amount of accumulated undistributed earnings (deficit).

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Name:	us-gaap_RetainedEarningsAccumulatedDeficit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Principal Accounting Policies - Accounts Receivable, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Jan. 01, 2023
Principal Accounting Policies
Net decrease in retained earnings	$ (511,961)	$ (569,851)
Cash settlement from commercial banks period	6 months
Bank acceptance notes, endorsed	$ 1,598	$ 1,991	$ 670
Accounting Standards Update 2016-13 \| Adjustment
Principal Accounting Policies
Net decrease in retained earnings				$ 460