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Business acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Feb. 28, 2021
Recognized amounts of identifiable assets acquired and liabilities assumed            
Amortization of intangible assets $ 663,000 $ 1,384,000 $ 2,322,000      
Goodwill   0 31,928,000      
Netless            
Business Combination, Consideration Transferred [Abstract]            
Cash         $ 3,150,000  
Recognized amounts of identifiable assets acquired and liabilities assumed            
Cash and cash-equivalents         556,000  
Accounts receivable         203,000  
Prepayments and other current assets         24,000  
Contract asset         15,000  
Fixed assets         85,000  
Intangible assets, net         213,000  
Other non-current assets         850,000  
Salary and welfare payable         (31,000)  
Taxes payable and other accrued liabilities         (16,000)  
Deferred tax liabilities         (53,200)  
Total identifiable net assets acquired         911,000  
Goodwill         3,089,000  
Total purchase consideration         $ 4,000,000  
Deferred tax liability, period of recognition         5 years  
Finite-lived intangible asset, useful life         5 years  
Netless | General and Administrative Expense [Member] | Developed Technology [Member]            
Recognized amounts of identifiable assets acquired and liabilities assumed            
Amortization of intangible assets 42,600 $ 42,600 42,600      
Acquisition Of Easemob [Member]            
Business Combination, Consideration Transferred [Abstract]            
Cash       $ 53,350,000    
Recognized amounts of identifiable assets acquired and liabilities assumed            
Cash and cash-equivalents       1,331,000    
Accounts receivable       451,000    
Prepayments and other current assets       704,000    
Contract asset       705,000    
Fixed assets       2,000    
Intangible assets, net       8,155,000    
Operating lease right-of-use assets       413,000    
Other non-current assets       26,000    
Accounts payable       (134,000)    
Advances from customers       (6,710,000)    
Salary and welfare payable       (2,863,000)    
Taxes payable and other accrued liabilities       (200,000)    
Operating lease liabilities       (363,000)    
Deferred tax liabilities     $ (1,200,000) (1,219,000)    
Total identifiable net assets acquired       298,000    
Goodwill       53,052,000    
Total purchase consideration       $ 53,350,000   $ 53,400,000
Acquisition Of Easemob [Member] | Developed Technology [Member]            
Recognized amounts of identifiable assets acquired and liabilities assumed            
Intangible assets, net $ 4,000,000          
Finite-lived intangible asset, useful life 5 years          
Acquisition Of Easemob [Member] | Accrued Expenses And Other Liabilities Current [Member]            
Recognized amounts of identifiable assets acquired and liabilities assumed            
Business Combination, Contingent Consideration, Liability, Current $ 2,600,000