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ADDITIONAL INFORMATION - CONDENSED FINANCIAL STATEMENTS - Consolidating Balance Sheets (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Current assets:        
Cash and cash equivalents $ 18,210 ¥ 118,821 ¥ 157,600 ¥ 211,436
Amounts due from related parties 463 3,024 2,318  
Prepaid expenses and other current assets 18,028 117,634 133,296  
Total current assets 65,000 424,129 399,640  
Non-current assets:        
Other non-current assets, net 21,313 139,067 70,971  
Total non-current assets 95,876 625,588 621,159  
Total assets 160,876 1,049,717 1,020,799  
Current liabilities:        
Amounts due to related parties 390 2,543 1,971  
Accrued and other liabilities 32,121 209,590 192,957  
Short-term borrowings 1,533 10,000    
Total current liabilities 98,635 643,595 608,984  
Non-current liabilities:        
Total non-current liabilities 40,608 264,968 248,219  
Total liabilities 139,243 908,563 857,203  
SHAREHOLDERS' EQUITY        
(US$ 0.003 par value; 1,666,667 shares authorized, nil issued and outstanding as of December 31, 2019 and 2020)  
Additional paid-in capital 543,306 3,545,073 3,508,745  
Accumulated other comprehensive income 1,855 12,101 6,341  
Total shareholders' equity 21,935 143,122 164,276  
Total liabilities and shareholders' equity 160,876 1,049,717 1,020,799  
Class A Ordinary Shares [Member]        
SHAREHOLDERS' EQUITY        
Ordinary shares 122 794 730  
Class C Ordinary Shares [Member]        
SHAREHOLDERS' EQUITY        
Ordinary shares 14 90 90  
Reportable Legal Entities [Member] | Parent Company [Member]        
Current assets:        
Cash and cash equivalents 35 226 652  
Amounts due from related parties 38,170 249,057 273,715  
Prepaid expenses and other current assets 32 211 2,349  
Total current assets 38,237 249,494 276,716  
Non-current assets:        
Other non-current assets, net 83 544    
Total non-current assets 83 544    
Total assets 38,320 250,038 276,716  
Current liabilities:        
Amounts due to related parties 14,484 94,510 85,358  
Accrued and other liabilities 1,901 12,406 27,082  
Total current liabilities 16,385 106,916 112,440  
Non-current liabilities:        
Total liabilities 16,385 106,916 112,440  
SHAREHOLDERS' EQUITY        
Additional paid-in capital 543,306 3,545,073 3,508,745  
Accumulated deficit (523,362) (3,414,936) (3,351,630)  
Accumulated other comprehensive income 1,855 12,101 6,341  
Total shareholders' equity 21,935 143,122 164,276  
Total liabilities and shareholders' equity 38,320 250,038 276,716  
Reportable Legal Entities [Member] | Parent Company [Member] | Class A Ordinary Shares [Member]        
SHAREHOLDERS' EQUITY        
Ordinary shares 122 794 730  
Reportable Legal Entities [Member] | Parent Company [Member] | Class C Ordinary Shares [Member]        
SHAREHOLDERS' EQUITY        
Ordinary shares $ 14 ¥ 90 ¥ 90