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Accounts Receivable Net - Summary of Accounts Receivable Net (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	¥ 6,458		¥ 8,361
Less: allowance for doubtful accounts			0
Accounts receivable, net	¥ 6,458	$ 1,013	¥ 8,361

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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