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Taxation - Additional information (Details) ¥ in Thousands, $ in Thousands, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 HKD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2020 CNY (¥) | Jan. 13, 2020 USD ($) | Jan. 13, 2020 CNY (¥) | Dec. 31, 2017 CNY (¥)
Income Tax Expense [Line Items] |  |  |  |  |  |  |
Effective income tax rate | (0.60%) | 0.00% | 0.00% |  |  |  |
Value added tax percentage | 6.00% |  |  |  |  |  |
Deferred tax assets due to tax losses |  | ¥ 89,713 |  | ¥ 120,703 |  |  |
Related valuation allowance |  | ¥ 89,713 | ¥ 62,714 | ¥ 120,703 |  |  | ¥ 48,555
Percentage withholding income tax dividends distributed by foreign-invested entity ("FIE") | 10.00% |  |  |  |  |  |
Withholding tax rate lowered if foreign investor owns shares of FIE | 5.00% |  |  |  |  |  |
Percentage share of FIE own directly by foreign investor | 25.00% |  |  |  |  |  |
Acquisition of Longye |  |  |  |  |  |  |
Income Tax Expense [Line Items] |  |  |  |  |  |  |
Deferred tax assets due to tax losses |  |  |  |  | $ 229 | ¥ 1,494 |
Related valuation allowance |  |  |  |  | $ 229 | ¥ 1,494 |
China | State Administration of Taxation, China |  |  |  |  |  |  |
Income Tax Expense [Line Items] |  |  |  |  |  |  |
Effective income tax rate | 25.00% |  |  |  |  |  |
Hong Kong | Inland Revenue, Hong Kong |  |  |  |  |  |  |
Income Tax Expense [Line Items] |  |  |  |  |  |  |
Assessable profits | $ | $ 2.0 |  |  |  |  |  |
First HK$2 million of profits, tax rate | 8.25% |  |  |  |  |  |
Effective income tax rate | 16.50% |  |  |  |  |  |

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