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Lines of Credit (Details) ¥ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2025 CNY (¥)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2025 CNY (¥)	Jun. 30, 2024 USD ($)	Jul. 30, 2025 USD ($)	Jul. 30, 2025 CNY (¥)	Jul. 15, 2025 USD ($)	Jun. 30, 2025 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 CNY (¥)	Dec. 16, 2024 USD ($)	Aug. 29, 2024 USD ($)	Aug. 29, 2024 CNY (¥)
Line of Credit Facility [Line Items]
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]				Secured Overnight Financing Rate (SOFR) [Member]	Secured Overnight Financing Rate (SOFR) [Member]
Amount outstanding under line of credit	$ 30,155,000			$ 30,155,000							$ 36,960,000
Line of credit | US Bank
Line of Credit Facility [Line Items]
Basis spread on variable rate				3.00%	3.00%
Line of credit facility, commitment fee percentage				0.25%	0.25%
Effective interest rate	7.29%			7.29%						7.29%	7.31%	7.31%
Line of credit | Second Amended Credit Agreement
Line of Credit Facility [Line Items]
Maximum borrowing capacity													$ 75,000,000.0
Remaining borrowing capacity	$ 53,600,000			$ 53,600,000
Line of credit | Second Amended Credit Agreement | Subsequent Event
Line of Credit Facility [Line Items]
Remaining borrowing capacity									$ 57,100,000
Line of credit | U.S. Line of Credit
Line of Credit Facility [Line Items]
Remaining borrowing capacity	34,600,000			34,600,000
Amount outstanding under line of credit	19,000,000			19,000,000							$ 26,000,000
Interest expense on borrowings	500,000		$ 1,100,000	1,100,000		$ 2,400,000
Facility fee expense	47,400		$ 63,200	94,300		$ 76,400
Line of credit | China Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity														$ 11,200,000	¥ 80.0
Remaining borrowing capacity	0			0							0
Amount outstanding under line of credit	11,200,000			11,200,000						¥ 80.0	$ 11,200,000	¥ 80.0
Interest expense on borrowings	$ 100,000	¥ 0.6		$ 200,000	¥ 1.2
Line of credit | China Line of Credit | Subsequent Event
Line of Credit Facility [Line Items]
Maximum borrowing capacity							$ 18,100,000	¥ 130.0
Line of credit | China Line of Credit | National Interbank
Line of Credit Facility [Line Items]
Basis spread on variable rate				0.10%	0.10%
Line of credit, interest rate	3.07%			3.07%						3.07%	3.07%	3.07%
Letter of credit
Line of Credit Facility [Line Items]
Letter of credit outstanding amount	$ 0			$ 0							$ 0

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Debt Instrument, Facility Fee Expense

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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The aggregate interest expense incurred on short-term borrowings including commercial paper and Federal funds purchased and securities sold under agreements to repurchase.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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The effective interest rate at the end of the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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