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Principal Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2023
Principal Accounting Policies  
Schedule of assets and liabilities that are measured at fair value on a recurring basis

Fair value measurement at reporting date using

    

Fair value 

    

Quoted Prices in Active

    

    

Significant 

as of 

 Markets for Identical 

Significant Other 

Unobservable

December 31, 

Assets 

Observable Inputs 

 Inputs 

Description

    

2022

    

(Level 1)

    

(Level 2)

    

(Level 3)

US$

US$

US$

US$

Assets:

 

  

 

  

 

  

 

  

Short-term investments

 

821,134

 

2,249

 

818,885

 

Long-term investments

18,031

366

17,665

839,165

2,249

819,251

17,665

 

Fair value measurement at reporting date using

    

Fair value

    

Quoted Prices in Active

    

    

Significant

 

as of

 

Markets for Identical

 

Significant Other

 

Unobservable

 

December 31, 

 

Assets

 

Observable Inputs

 

Inputs

Description

    

2023

    

(Level 1)

    

(Level 2)

    

(Level 3)

 

US$

US$

US$

US$

Assets:

Short-term investments

 

291,023

 

2,265

 

288,758

 

Long-term investments

 

10,110

 

 

236

 

9,874

301,133

2,265

288,994

9,874

Schedule of roll forward of major Level 3 investments

    

US$

Fair value of Level 3 investments as of December 31, 2021

 

25,583

New addition

 

1,575

The change in fair value of the investments

 

(9,493)

Fair value of Level 3 investments as of December 31, 2022

 

17,665

The change in fair value of the investments

(7,791)

Fair value of Level 3 investments as of December 31, 2023

9,874

Schedule of significant unobservable inputs adopted in the valuation

    

As of December 31, 

 

    

2022

    

2023

Unobservable Inputs

    

Expected volatility

 

40%-63

%

40%-59

%

Probability

 

Liquidation scenario:35%-45

%

Liquidation scenario:38%-40

%

 

Redemption scenario:35%-45

%

Redemption scenario:38%-40

%

 

IPO scenario:10%-30

%

IPO scenario:20%-25

%

Schedule of property, plant and equipment estimated useful life

Leasehold improvements

    

the shorter of their useful lives and the lease terms

Computers and electronic equipment

 

3 years

Office equipment

 

3 years

Software

 

3 years

Disaggregated major revenue

Year Ended December 31, 

    

2021

    

2022

    

2023

US$

US$

US$

IoT PaaS

 

261,360

 

152,914

167,694

Smart device distribution

 

22,153

 

25,446

26,517

SaaS and others

 

18,563

 

29,812

35,779

Total revenue

 

302,076

 

208,172

229,990