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Intangible Assets, Net - Summary of intangible assets, net (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Intangible assets, Net    
Total gross value ¥ 61,965 ¥ 45,864
Less: amortization (28,649) (22,896)
impairment (10,821) (10,572)
Net book value 22,495 12,396
Computer software    
Intangible assets, Net    
Total gross value 20,243 18,314
Licensed copyrights of reading content    
Intangible assets, Net    
Total gross value 28,657 15,709
Audio content    
Intangible assets, Net    
Total gross value 12,907 11,683
Trademark and domain name    
Intangible assets, Net    
Total gross value ¥ 158 ¥ 158