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INCOME TAX - Schedule of Deferred Income Tax Assets (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]        
Net operating loss carry forwards ¥ 280,865 ¥ 218,478 ¥ 149,073  
Uninvoiced expenditures 9,867 6,204 23,400  
Accounts receivable and contract assets allowance 16,486 12,707 5,367  
Other equity investments impairment 11,412 10,337 5,836  
Goodwill impairment 38,690 1,417 1,417  
Share of losses of equity method investments 149 174 174  
Others   9 26  
Less: Valuation allowance (335,339) (239,007) (180,643) ¥ (131,834)
Total deferred income tax assets, net 22,131 10,319 4,650  
Intangible assets (8,883) (185) (259)  
Equity method investment on the gain from the disposal of a subsidiary (2,766)      
Change in fair value of other equity investments (19,365) (10,319) (4,650)  
Total gross deferred income tax liabilities (31,014) (10,504) (4,909)  
Net deferred income tax assets ¥ (8,883) ¥ (185) ¥ (259)