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

Fair Value Measurement at Reporting Date Using

Quoted Prices 

Significant 

in Active 

Other

Significant 

Fair Value as of 

Markets for

Observable

Unobservable

June 30, 

Identical Assets

Inputs

Inputs

2026

(Level 1)

(Level 2)

(Level 3)

  ​ ​ ​

US$

  ​ ​ ​

US$

  ​ ​ ​

US$

  ​ ​ ​

US$

 Assets

 

  ​

 

  ​

 

  ​

 

  ​

Investment securities

 

1,358

1,358

Liabilities

 

 

 

 

Warrant liabilities

845

845

Convertible notes

269,047

269,047

Fair Value Measurement at Reporting Date Using

Quoted Prices 

Significant 

in Active 

Other

Significant 

Fair Value as of 

Markets for

Observable

Unobservable

December 31, 

Identical Assets

Inputs

Inputs

2025

(Level 1)

(Level 2)

(Level 3)

  ​ ​ ​

US$

  ​ ​ ​

US$

  ​ ​ ​

US$

  ​ ​ ​

US$

 Assets

 

  ​

 

  ​

 

  ​

 

  ​

Investment securities

 

1,811

1,811

Liabilities

 

 

  ​

 

  ​

 

  ​

Warrant liabilities

800

 

800

 

 

Convertible notes

276,604

276,604

Exchangeable notes

 

128,852

 

 

 

128,852