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BALANCE SHEET COMPONENTS - Other Long-term Assets (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Other Long-term Debt [Abstract] |  |  |  |
Hong Kong Tax deposit | $ 57,423 | $ 35,495 |  |
Intangible assets, net | 9,021 | 3,063 |  |
Other long-term assets, net | 5,752 | 4,665 |  |
Total | 72,196 | 43,223 |  |
Accumulated amortization, intangible assets | 2,400 | 1,800 |  |
Income Tax Examination [Line Items] |  |  |  |
Hong Kong Tax deposit | 57,423 | 35,495 |  |
Hong Kong Inland Revenue Department |  |  |  |
Other Long-term Debt [Abstract] |  |  |  |
Hong Kong Tax deposit | 57,400 |  |  |
Income Tax Examination [Line Items] |  |  |  |
Hong Kong Tax deposit | 57,400 |  |  |
Payment for tax deposit | 21,900 | $ 15,500 | $ 13,400 | $ 6,600
Hong Kong Inland Revenue Department | Tax year 2010 - 2014 |  |  |  |
Other Long-term Debt [Abstract] |  |  |  |
Hong Kong Tax deposit | 57,400 |  |  |
Income Tax Examination [Line Items] |  |  |  |
Hong Kong Tax deposit | $ 57,400 |  |  |

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