SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details) |
12 Months Ended |
|---|---|
Jun. 30, 2020 | |
| Testing equipment | Minimum | |
| Property, Plant and Equipment [Line Items] | |
| Estimated Useful Life | 3 years |
| Testing equipment | Maximum | |
| Property, Plant and Equipment [Line Items] | |
| Estimated Useful Life | 5 years |
| Computer and other equipment | Minimum | |
| Property, Plant and Equipment [Line Items] | |
| Estimated Useful Life | 3 years |
| Computer and other equipment | Maximum | |
| Property, Plant and Equipment [Line Items] | |
| Estimated Useful Life | 5 years |
| Furniture and fixtures | Minimum | |
| Property, Plant and Equipment [Line Items] | |
| Estimated Useful Life | 3 years |
| Furniture and fixtures | Maximum | |
| Property, Plant and Equipment [Line Items] | |
| Estimated Useful Life | 5 years |
| Software | Maximum | |
| Property, Plant and Equipment [Line Items] | |
| Estimated Useful Life | 3 years |
| Corporate aircraft | Maximum | |
| Property, Plant and Equipment [Line Items] | |
| Estimated Useful Life | 15 years |