SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible Assets (Details) |
12 Months Ended |
|---|---|
Jun. 30, 2020 | |
| Domain Names | |
| Finite-Lived Intangible Assets [Line Items] | |
| Useful lives of intangible assets | 15 years |
| Other Intangible Assets | |
| Finite-Lived Intangible Assets [Line Items] | |
| Useful lives of intangible assets | 5 years |