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Discontinued operations - Additional Information (Details)
1 Months Ended
Jan. 31, 2018
Dec. 31, 2017
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Discontinued operations [Line Items]        
Web game business period, after completion of disposal 24 months      
Maximum        
Discontinued operations [Line Items]        
Period the Company will assist buyer with collection and payment of certain receivables and payables per Disposal Agreement   1 year    
Web Game Business [Member]        
Discontinued operations [Line Items]        
Sales price     ¥ 4,180,000 $ 640,000