v3.26.3
FAIR VALUE MEASUREMENT (Tables)
6 Months Ended
Jun. 30, 2026
FAIR VALUE MEASUREMENT  
Schedule of major financial instruments measured at fair value, by level within the fair value hierarchy

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Fair Value Measurement at Reporting Date Using

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Quoted Prices 

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Significant 

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in Active 

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Other

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Significant 

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​

Fair Value as of 

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Markets for

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Observable

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Unobservable

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June 30, 

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Identical Assets

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Inputs

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Inputs

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2026

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(Level 1)

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(Level 2)

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(Level 3)

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  ​ ​ ​

US$

  ​ ​ ​

US$

  ​ ​ ​

US$

  ​ ​ ​

US$

 Assets

 

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  ​

 

  ​

 

  ​

Investment securities

 

1,358

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1,358

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—

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—

Liabilities

 

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​

 

​

 

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Warrant liabilities

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845

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845

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—

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—

Convertible notes

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269,047

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—

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—

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269,047

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Fair Value Measurement at Reporting Date Using

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​

​

​

Quoted Prices 

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Significant 

​

​

​

​

​

​

in Active 

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Other

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Significant 

​

​

Fair Value as of 

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Markets for

​

Observable

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Unobservable

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​

December 31, 

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Identical Assets

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Inputs

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Inputs

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2025

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(Level 1)

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(Level 2)

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(Level 3)

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  ​ ​ ​

US$

  ​ ​ ​

US$

  ​ ​ ​

US$

  ​ ​ ​

US$

 Assets

 

  ​

 

  ​

 

  ​

 

  ​

Investment securities

 

1,811

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1,811

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—

​

—

Liabilities

 

​

 

  ​

 

  ​

 

  ​

Warrant liabilities

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800

 

800

 

—

 

—

Convertible notes

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276,604

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—

​

—

​

276,604

Exchangeable notes

 

128,852

 

—

 

—

 

128,852