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Income Taxes - Reconciliation of liabilities associated with uncertain tax positions (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Income Tax Disclosure [Abstract] |  |  |  |
Balance as of January 1, | ¥ 26,131 | $ 3,753 | ¥ 24,714 | ¥ 21,723
Increase related to current year tax positions | 1,481 | 213 | 1,417 | 2,991
Balance as of December 31, | ¥ 27,612 | $ 3,966 | ¥ 26,131 | ¥ 24,714

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