FAIR VALUE MEASUREMENT - Schedule of major financial instruments measured at fair value (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Assets
Securities pledged to an investor	$ 320,734	$ 315,796
Liabilities
Warrant Liabilities	1,618	3,340
Level 1
Assets
Investment securities	2,158	2,221
Securities pledged to an investor	320,734	315,796
Level 1 \| Public warrants
Liabilities
Warrant Liabilities	951	1,996
Level 2
Assets
Derivative asset		694
Level 3
Liabilities
Put option liabilities	363,521
Exchangeable notes	125,853	102,999
Level 3 \| Related party
Liabilities
Convertible notes	199,046	113,910
Level 3 \| Nonrelated Party
Liabilities
Put option liabilities		309,115
Convertible notes	63,855	74,246
Level 3 \| Sponsor Warrants
Liabilities
Warrant Liabilities	667	1,344
Recurring
Assets
Investment securities	2,158	2,221
Securities pledged to an investor	320,734	315,796
Derivative asset		694
Liabilities
Put option liabilities	363,521
Exchangeable notes	125,853	102,999
Recurring \| Related party
Liabilities
Convertible notes	199,046	113,910
Recurring \| Nonrelated Party
Liabilities
Put option liabilities		309,115
Convertible notes	63,855	74,246
Recurring \| Public warrants
Liabilities
Warrant Liabilities	951	1,996
Recurring \| Sponsor Warrants
Liabilities
Warrant Liabilities	$ 667	$ 1,344

Fair value portion of exchangeable notes.

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The fair value of amount that is required to be paid, determined under the conditions specified in the contract, if as of the reporting date, the holder of the share has exercised the right to or the shares are mandatorily redeemable after one year from the reporting date or operating cycle, if longer.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value portion of notes payable.

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The aggregate value of all restricted investments.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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