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Contract balances (Details) - Schedule of contract assets, accounts receivable, deferred revenue and financial liabilities from contracts with customers ¥ in Thousands, $ in Thousands | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥)
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Schedule of contract assets, accounts receivable, deferred revenue and financial liabilities from contracts with customers [Abstract] |  |  |  |
Accounts receivable |  | ¥ 52,866 |  | ¥ 30,654
Less: Allowance for doubtful debts | [1] | (25,853) |  | (1,751)
Accounts receivable, net |  | 27,013 | $ 4,140 | 28,903
Contract assets |  | 6,194 |  | 7,824
Deferred revenue |  | 388,861 |  | 468,815
-current |  | 341,934 | 52,404 | 408,287
-non-current |  | 46,927 | $ 7,192 | 60,528
Financial liabilities from contracts with customers |  | ¥ 384,561 |  | ¥ 490,095
[1] | Changes in the allowance for doubtful accounts were as follows:

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