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Revenues - Additional Information (Details) ¥ in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2021 CNY (¥)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 CNY (¥)
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	¥ 165,609	$ 25,650	¥ 257,018
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	98,405	15,241	196,006
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	¥ 67,204	$ 10,409	¥ 61,012

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

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