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Contract balances (Tables)
 12 Months Ended
Dec. 31, 2020
Contract Balances [Abstract]  
Schedule of contract assets, accounts receivable, deferred revenue and financial liabilitie from contracts with customers
   As of December 31, 
   2019   2020 
   RMB’000   RMB’000 
Accounts receivable   30,654    52,866 
Less: Allowance for doubtful debts (i)   (1,751)   (25,853)
Accounts receivable, net   28,903    27,013 
Contract assets   7,824    6,194 
Deferred revenue          
-current   408,287    341,934 
-non-current   60,528    46,927 
Financial liabilities from contracts with customers   490,095    384,561 
(i)Changes in the allowance for doubtful accounts were as follows:
Schedule of allowance for doubtful accounts
   As of December 31, 
   2019   2020 
   RMB’000   RMB’000 
At the beginning of the year   125    1,751 
Allowance made during the year   1,700    25,694 
Write-off   (74)   (1,592)
At the end of the year   1,751    25,853 
Schedule of contract assets
   As of December 31, 
   2019   2020 
   RMB’000   RMB’000 
At the beginning of the year   14,208    7,824 
Net off the beginning contract assets with financial liabilities, as the result of rights to consideration becoming unconditional   (13,527)   (7,384)
Contract assets recognized with the recognition of revenue during the year   7,143    5,754 
At the end of the year   7,824    6,194 
Schedule of deferred revenue and financial liabilities
   As of December 31, 
   2019   2020 
   RMB’000   RMB’000 
At the beginning of the year   907,415    958,910 
Net off the beginning contract assets with financial liabilities, as the result of rights to consideration becoming unconditional   (13,527)   (7,384)
Revenue recognized that was included in the contract liabilities and financial liabilities at the beginning of the year   (709,412)   (644,097)
Increase due to cash received, excluding amount recognized as revenue or refunded   754,592    465,993 
Disposal of subsidiaries   (5,256)   - 
Business combination (note 4)   25,098    - 
At the end of the year   958,910    773,422 
Schedule of consolidated balance sheets
   As of December 31, 
   2019   2020 
   RMB’000   RMB’000 
Deferred revenue   468,815    388,861 
Financial liabilities   490,095    384,561