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Revenue and Segment Reporting (Details) - Schedule of segment revenue and results - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenue from external customers ¥ 884,130 ¥ 1,415,852 ¥ 1,405,149
Reportable segment revenue 884,130 1,415,852 1,405,149
Reportable segment gross profit 286,564 674,565 791,558
General adult English training [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenue from external customers 333,500 783,988 903,756
Reportable segment revenue 333,500 783,988 903,756
Reportable segment gross profit 104,875 422,517 566,994
Overseas training services [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenue from external customers 130,567 203,677 223,601
Reportable segment revenue 130,567 203,677 223,601
Reportable segment gross profit 34,318 86,358 103,703
Online English training [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenue from external customers 289,715 260,263 212,302
Reportable segment revenue 289,715 260,263 212,302
Reportable segment gross profit 119,438 104,620 97,144
Junior English training [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenue from external customers 130,348 167,924 65,490
Reportable segment revenue 130,348 167,924 65,490
Reportable segment gross profit 27,933 61,070 23,717
Point in time [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Disaggregated by timing of revenue recognition 93,397 93,454 93,538
Point in time [Member] | General adult English training [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Disaggregated by timing of revenue recognition 93,397 93,454 93,538
Point in time [Member] | Overseas training services [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Disaggregated by timing of revenue recognition  
Point in time [Member] | Online English training [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Disaggregated by timing of revenue recognition  
Point in time [Member] | Junior English training [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Disaggregated by timing of revenue recognition  
Overtime [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Disaggregated by timing of revenue recognition 790,733 1,322,398 1,311,611
Overtime [Member] | General adult English training [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Disaggregated by timing of revenue recognition 240,103 690,534 810,218
Overtime [Member] | Overseas training services [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Disaggregated by timing of revenue recognition 130,567 203,677 223,601
Overtime [Member] | Online English training [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Disaggregated by timing of revenue recognition 289,715 260,263 212,302
Overtime [Member] | Junior English training [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Disaggregated by timing of revenue recognition ¥ 130,348 ¥ 167,924 ¥ 65,490