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Stockholders' Equity (Details 5) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | $ 2,367,000 | $ 415,800 | $ 1,214,000 | $ 518,000
Research and development [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | 174,500 | 29,500 | 215,900 | 62,500
General and administrative [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | $ 2,192,500 | $ 386,300 | $ 998,100 | $ 455,500

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