Business acquisition (Tables)
 12 Months Ended
Dec. 31, 2021
Business Acquisition [Line Items]  
Schedule of Estimated Fair Value of Assets Acquired and Liabilities Assumed
 
  
As of acquisition
close date
 
 
  
2020
 
 
  
(US$ thousand)
 
Fair value of consideration transferred
         
Cash
(1)
    $ 3,150  
Ordinary shares
      850  
Number of ordinary shares issued
      85  
Recognized amounts of identifiable assets acquired and liabilities assumed
         
Cash and cash-equivalents
    $ 556  
Accounts receivable
      203  
Prepayments and other current assets
      24  
Property and equipment, net
      15  
Intangible assets, net
      213  
Salary and welfare payable
      (31 ) 
Taxes payable and other accrued liabilities
      (16 ) 
Deferred tax liabilities
(2)
      (53 ) 
    
 
 
  
Total identifiable net assets acquired
      911  
    
 
 
  
Goodwill
      3,089  
    
 
 
  
Total purchase consideration
    $ 4,000  
    
 
 
  
 
(1)
The cash payment for Netless was made in first and second quarter of 2021.
(2)
As part of the business combination, the Company acquired developed technology at a gross amount of US$0.2 million, with an estimated useful life of 5 years that will be amortized on a straight-line basis; amortization expense of US$3.5 thousand and US$42.6 thousand recorded in general and administrative expense for the year ended December 31, 2020 and 2021. A deferred tax liability of US$53.2 thousand arising from the difference between the accounting basis and tax basis of the identifiable intangible asset is recognized and will be realized over 5 years which is in line with the developed technology’s amortization period. The recognition of the deferred tax liability related to the intangible asset in turn increases the book basis of the asset.
Acquisition Of Easemob [Member]  
Business Acquisition [Line Items]  
Schedule of Estimated Fair Value of Assets Acquired and Liabilities Assumed
The acquisition was recorded as a business combination. The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the date of acquisition, as well as the fair value of the consideration transferred:
 
 
  
As of acquisition
close date
 
 
  
2021
 
 
  
(US$ thousand)
 
Fair value of consideration transferred
         
Cash
(1)
    $ 53,350  
Recognized amounts of identifiable assets acquired and liabilities assumed
         
Cash and cash-equivalents
    $ 1,331  
Accounts receivable
      451  
Prepayments and other current assets
      704  
Contract asset
      705  
Fixed assets
      2  
Intangible assets, net
      8,155  
Operating lease
right-of-use
assets
      413  
Other
non-current
assets
      26  
Accounts payable
      (134 ) 
Advances from customers
      (6,710 ) 
Salary and welfare payable
      (2,863 ) 
Taxes payable and other accrued liabilities
      (200 ) 
Operating lease liabilities
      (363 ) 
Deferred tax liabilities
(2)
      (1,219 ) 
    
 
 
  
Total identifiable net assets acquired
      298  
    
 
 
  
Goodwill
      53,052  
    
 
 
  
Total purchase consideration
    $ 53,350  
    
 
 
  
 
(1)
The cash consideration for Easemob has not been fully paid. As of December 31, 2021, the amount of US$4.6 million was recorded as a payable in accrued expenses and other current liabilities.
(2)
A deferred tax liability of US$
1.2
 million arising from the difference between the accounting basis and tax basis of the identifiable intangible asset is recognized. The recognition of the deferred tax liability related to the intangible asset in turn increases the book basis of the asset.