Income Taxes - Additional Information (Details) ¥ in Thousands, $ in Thousands	6 Months Ended
Jun. 30, 2022 CNY (¥)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 CNY (¥)	Jun. 30, 2022 USD ($)
Income Tax Disclosure [Line Items]
Income tax expenses	¥ 135	$ 20	¥ 11
Effective income tax rate	0.24%	0.24%	0.03%
Uncertain income tax liabilities	¥ 117			$ 17
Uncertain tax positions income tax penalties	0		¥ 0
Uncertain tax positions income tax interest	¥ 0		¥ 0
Hong Kong
Income Tax Disclosure [Line Items]
Effective profits tax rate	16.50%	16.50%
PRC
Income Tax Disclosure [Line Items]
Effective statutory enterprise income tax rate	25.00%	25.00%
Effective preferential income tax rate	15.00%	15.00%

Effective preferential income tax rate.

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Effective profits tax rate.

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Income tax disclosure.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of unrecognized tax benefits.

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Amount of expense for penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of interest expense for an underpayment of income taxes.

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