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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Variable Interest Entities (Details) |  | 12 Months Ended |  |
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Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 22, 2018
Tianjin Mingda Jiahe Real Estate Co., Ltd. Yangzhou Branch | VIEs |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Date of Formation |  | Oct. 18, 2017 |  |
Place of Formation |  | Yangzhou, China |  |
Tianjin Mingdajiahe Real Estate Co., Ltd. Suzhou Branch | VIEs |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Date of Formation |  | Oct. 13, 2017 |  |
Place of Formation |  | Suzhou, China |  |
Tianjin Mingdajiahe Real Estate Co., Ltd. Chengdu Branch | VIEs |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Date of Formation |  | Jun. 24, 2019 |  |
Place of Formation |  | Chengdu, China |  |
XiShe (Tianjin) Business Management Co., Ltd. | VIEs |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ownership interest held |  | 100.00% |  |
Date of Formation |  | Oct. 20, 2017 |  |
Place of Formation |  | Tianjin, China |  |
XiShe (Tianjin) Culture and Media Co., Ltd. | VIEs |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ownership interest held |  | 100.00% |  |
Date of Formation |  | Jul. 25, 2018 |  |
Place of Formation |  | Tianjin, China |  |
Xishe Xianglin (Tianjin) Business Operation & Management Co., Ltd. |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners |  | 49.00% | 49.00% |
Xishe Xianglin (Tianjin) Business Operation & Management Co., Ltd. | VIEs |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ownership interest held |  | 51.00% |  |
Date of Formation |  | Mar. 09, 2018 |  |
Place of Formation |  | Tianjin, China |  |
Xishe Jiayuan (Tianjin) Business Operation & Management Co. Ltd |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ownership interest held |  |  |  | 70.00%
Tianjin Jin Yong Tai Property Management Ltd |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners |  |  |  | 30.00%
Tianjin Jin Yong Tai Property Management Ltd | Jiayuan Project |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ownership interest transferred | 70.00% |  |  |

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