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Short-term Bank Loans and Long-term Loan - Loan principal is repayable (Details) - Dec. 31, 2021 ¥ in Thousands, $ in Thousands	CNY (¥)	USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]
2022	¥ 269	$ 42
2023	357	56
2024	357	56
2025	89	14
Long Term Debt	¥ 1,072	$ 168

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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