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Stockholders' Equity (Deficit) - Schedule of Stock-Based Compensation Expenses (Details) - USD ($) | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Total stock-based compensation expense | $ 797,000 | $ 1,803,000
Research and Development [Member] |  |
Total stock-based compensation expense | 178,000 | 215,000
General and Administrative [Member] |  |
Total stock-based compensation expense | $ 619,000 | $ 1,588,000

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