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INCOME TAXES - Additional Information (Detail) - CNY (¥)
12 Months Ended 36 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Income Taxes [Line Items]        
Income tax rate 25.00% 25.00% 25.00%  
Valuation allowances ¥ 1,909,000 ¥ 619,533,000   ¥ 1,909,000
Tax loss carry-forward ¥ 54,380,000 ¥ 2,307,241,000 ¥ 2,076,261,000 ¥ 54,380,000
Tax loss carry-forward, limitations on use The Company operates its business through its subsidiaries and VIEs. The Company does not file consolidated tax returns, therefore, losses from individual subsidiaries or the VIEs may not be used to offset other subsidiaries' or VIEs' earnings within the Company.      
Tax loss carry-forward, expiration date Dec. 31, 2023 Dec. 31, 2022    
Foreign investment enterprises, withholding income tax rate 10.00%      
Foreign investment enterprises, withholding income tax rate for those who qualifies as a beneficial owner 5.00%      
Foreign investment enterprises, threshold of beneficial ownership to qualify for reduction in withholding income tax rate 25.00%      
Foreign investment enterprises, withholding income tax rate for those who do not qualify as a beneficial owner 10.00%      
Shanghai Niwodai Internet Finance Information Services Co., Ltd.        
Income Taxes [Line Items]        
Income tax rate       15.00%
PRC        
Income Taxes [Line Items]        
Income tax rate 25.00%      
Preferential tax rate 15.00%      
Statute of limitations period (in years)   3 years    
Extension period for statute of limitations under special circumstances (in years)   5 years    
Amount of underpayment threshold of tax liability listed as special circumstance ¥ 100,000     ¥ 100,000
Statute of limitations period for related party transaction (in years)   10 years    
Statute of limitations period for tax evasion (in years)   0 years    
Hong Kong        
Income Taxes [Line Items]        
Income tax rate 16.50%