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ADDITIONAL INFORMATION - CONDENSED FINANCIAL STATEMENTS - Consolidating Statement of Operations (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
NET REVENUES        
Revenues $ 81,529 ¥ 531,980 ¥ 583,909 ¥ 531,508
Cost of revenues        
Cost of Revenue 59,386 387,490 388,894 338,143
GROSS LOSS 22,143 144,490 195,015 193,365
Operating expenses:        
Selling and marketing (8,024) (52,355) (55,721) (43,751)
General and administrative (26,710) (174,283) (194,417) (132,718)
Research and development (874) (5,703) (3,793) (1,513)
Total operating expenses (41,232) (269,040) (292,685) (177,982)
OPERATING INCOME (LOSS) (19,089) (124,550) (97,670) 15,383
OTHER EXPENSE        
Interest income (expense), net 1,456 9,501 5,379 6,652
Other income, net (191) (1,244) 396 1,447
Income tax (163) (1,062) (12,917) (3,498)
Educational program and services        
NET REVENUES        
Revenues 80,571 525,727 582,706 525,134
Cost of revenues        
Cost of Revenue 58,172 379,571 383,635 331,939
Intellectualized operational services        
NET REVENUES        
Revenues 958 6,253 1,203 6,374
Cost of revenues        
Cost of Revenue 1,214 7,919 5,259 6,204
Reportable Legal Entities [Member] | Parent Company [Member]        
Operating expenses:        
General and administrative (1,202) (7,841) (12,380) (1,097)
Total operating expenses (1,202) (7,841) (12,380) (1,097)
OPERATING INCOME (LOSS) (1,202) (7,841) (12,380) (1,097)
Share of income (loss) from subsidiaries (8,486) (55,362) (159,282) 44,864
OTHER EXPENSE        
Interest income (expense), net     (267) 117
Other income, net 75 491 71,988 1,106
NET INCOME (LOSS) $ (9,613) ¥ (62,712) ¥ (99,941) ¥ 44,990