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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

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