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Ordinary shares - Additional Information (Details) $ / shares in Units, ¥ in Thousands, $ in Millions			12 Months Ended		13 Months Ended
	Nov. 20, 2018 USD ($) $ / shares shares	Nov. 20, 2018 CNY (¥) shares	Dec. 31, 2020	Dec. 31, 2018 CNY (¥)	Aug. 31, 2020 shares
Number of shares issued					80,000
Proceeds from issuance of IPO,net of issuance cost | ¥				¥ 103,372
ADS
Number of shares issued					20,000
Number of initial public offering	2,600,000	2,600,000
Class A ordinary shares
Number of shares issued	10,400,000	10,400,000
Proceeds from issuance of IPO,net of issuance cost	$ 15.0	¥ 103,400
Number of initial public offering	2,600,000	2,600,000
Issuance Price per Share (US$) | $ / shares	$ 7.80
Pre-IPO China Best Redeemable and Series A to Series C
Conversion ratio to class A ordinary shares			1
Series D1 and Series D2 Shares
Conversion ratio to class A ordinary shares			1.47

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Per share or per unit amount of equity securities issued.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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