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COMMITMENTS AND CONTINGENCIES - Legal proceeding (Detaills) - Mingda Tianjin (VIE) |  |  |  | 1 Months Ended |
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Sep. 05, 2019 CNY (¥) | Sep. 05, 2019 USD ($) | Jan. 10, 2019 CNY (¥) | Jan. 10, 2019 USD ($) | Jan. 03, 2018 CNY (¥) | Jan. 03, 2018 USD ($) | Nov. 30, 2018 CNY (¥) | Nov. 30, 2018 USD ($) | Sep. 18, 2018 CNY (¥) | Sep. 18, 2018 USD ($) | Nov. 30, 2015 CNY (¥) | Nov. 30, 2015 USD ($) | Jan. 10, 2019 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
First installment of sales agency fees received |  |  |  |  |  |  |  |  | ¥ 1,845,722 | $ 267,217 |  |  |
payment of installments | 105,437 | 15,265 |  |  |  |  | 1,736,378 | 251,387 |  |  |  |  |
Tianjin Huacheng Century Investment Co. Ltd | Sales Agency Service Contract |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, default amount of sales agency fees and retention fees |  |  |  |  |  |  |  |  |  |  | ¥ 2,792,854 | $ 429,700 |
Civil Mediation Agreement | Tianjin Huacheng Century Investment Co. Ltd | Sales Agency Service Contract |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
First installment of sales agency fees due by or before February 9, 2018 |  |  |  |  | ¥ 500,000 | $ 76,900 |  |  |  |  |  |  |
Second installment of sales agency fees due by or before October 31, 2018 |  |  |  |  | 1,146,427 | 176,400 |  |  |  |  |  |  |
Third installment of sales agency fees due by or before December 31, 2018 |  |  |  |  | ¥ 1,146,427 | $ 176,400 |  |  |  |  |  |  |
Percentage of balance due as agreed to pay by defendant |  |  | 90.00% |  |  |  |  |  |  |  |  |  | 90.00%
Balance of damages due |  |  | ¥ 2,063,569 |  |  |  |  |  |  |  |  |  | $ 300,033
Total amount received from defendant |  |  | ¥ 2,063,568 | $ 300,033 |  |  |  |  |  |  |  |  |

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