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Stockholders' Equity (Details Textual) - USD ($) |  |  |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 08, 2019 | Apr. 01, 2019 | Mar. 09, 2019 | Jan. 02, 2019 | Oct. 12, 2018 | Dec. 19, 2019 | Aug. 01, 2019 | Dec. 20, 2018 | Oct. 18, 2018 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stocks issued |  |  |  |  |  |  |  |  |  | 61,484 |  |  | 24,991 | 4,437
Other receivable |  |  |  |  |  |  |  |  |  |  | $ 177,000 |  | $ 177,000 |
Percentage of convertible promissory notes |  |  |  |  | 7.00% |  |  |  | 7.00% |  |  |  |  |
Converted shares of common stock |  |  |  |  | 2,682,917 |  |  |  | 2,682,917 |  |  |  |  |
Shares issued for cashless exercise of warrants |  |  |  |  |  |  |  |  |  | 88,751 | 25,004 |  | 25,004 | 4,443
Options to purchase of common stock |  |  |  |  |  |  |  |  |  | 61,484 |  |  |  |
Unrecognized stock-based compensation expense |  |  |  |  |  |  |  |  |  | $ 54,454,000 |  |  |  |
Weighted average fair value of options granted |  |  |  |  |  |  |  |  |  | $ 29.32 |  | $ 4.60 | $ 3.84 | $ 2.64
Vested shares to be issued |  |  |  |  |  |  |  |  |  |  |  |  | 50,000 |
Unrecognized stock-based compensation expense, period for recognition |  |  |  |  |  |  |  |  |  |  |  |  | 3 years 1 month 24 days |
Warrants expired |  |  |  |  |  |  |  |  |  |  |  |  |  | 643,643
Agreement description |  |  |  |  |  |  |  |  |  |  |  |  | The Company closed on private placements of securities pursuant to Unit Purchase Agreements and Subscription Agreements, each dated as shown below. The price per unit (comprising one common stock and a 5 year warrant to purchase 2.60 or 2.00 of a share of common stock) was $3.60, $5.60 or $6.00. The Company issued an aggregate of 3,975,115 shares of common stock to investors in these closings, for net proceeds of $17,839,656. |
Legal costs |  |  |  |  |  |  |  |  |  |  |  |  | $ 79,000 |
Cashless exercise of option |  |  |  |  |  |  |  |  |  | 67,578 |  |  |  |
Description of private placement |  |  |  |  |  |  |  |  |  | The Company closed on a private placement of 3,833,334 shares of common stock. The price per share was $30.00 to the public (with a price to the underwriters of $28.00 per share). The net proceeds from the closing was $108,621,733. Approximately, $478,000 of legal and professional fees were incurred in relation to the closing. The Company also closed on a private placement of 117,965 shares for $7.00 per share and net proceeds of $825,749 during the 3rd calendar quarter of 2019. |  |  |  |
Stock Option and Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate fair value of options |  | $ 214,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  | 37,500 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available for future grants under stock option plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options term, description |  | Ten year term. |  |  |  |  |  |  |  |  |  |  |  |
Options exercise price |  | $ 7.04 |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |
Description of employees options |  |  |  |  |  | The Company granted employees options to purchase a total of 1,295,000 shares of common stock. The options have a ten-year term and have an exercise price of $43.47 and vest over 4 years. The options have an aggregate fair value of $46,904,043 calculated using the Black-Scholes option-pricing model. Variables used in the Black-Scholes option-pricing model include: (1) discount rate of 1.79% (2) expected life of 6.25 years, (3) expected volatility of 108.2%, and (4) zero expected dividends. |  | The Company granted various employees options to purchase a total of 675,000 shares of common stock. The options have a ten-year term and have an exercise price of $4.6 and vest over 4 years. The options have an aggregate fair value of $2,500,000 calculated using the Black-Scholes option-pricing model. Variables used in the Black-Scholes option-pricing model |  |  |  |  |  |
Discount rate |  | 2.37% |  |  |  | 1.79% |  | 2.69% |  |  |  |  |  |
Expected life term |  | 6 years 2 months 30 days |  |  |  | 6 years 2 months 30 days |  | 6 years 2 months 30 days |  |  |  |  |  |
Expected volatility rate |  | 101.50% |  |  |  | 108.20% |  | 102.30% |  |  |  |  |  |
Expected dividends rate |  | 0.00% |  |  |  | 0.00% |  | 0.00% |  |  |  |  |  |
Stock-based compensation - warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for consulting services, shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 84,650
Unrecognized stock-based compensation expense |  |  |  |  |  |  |  |  |  | $ 129,000 |  |  |  |
Aggregate intrinsic value of warrants vested and outstanding |  |  |  |  |  |  |  |  |  | 115,731,488 |  |  |  |
Warrants issued to note holders |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,833
Expenses from issuances of warrants |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  | $ 0 | $ 50,000
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  | 2,205,000 |  |  | 712,500 | 662,500
Weighted average fair value of options granted |  |  |  |  |  |  |  |  |  | $ 29.32 |  |  | $ 4.73 | $ 3.28
Discount rate |  |  |  |  |  |  |  |  |  |  |  | 2.69% |  |
Expected life term |  |  |  |  |  |  |  |  |  |  |  | 6 years 2 months 30 days | 6 years 2 months 30 days | 6 years 2 months 30 days
Expected volatility rate |  |  |  |  |  |  |  |  |  |  |  | 102.30% |  |
Expected dividends rate |  |  |  |  |  |  |  |  |  | 0.00% |  | 0.00% | 0.00% | 0.00%
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 133,000 |
Weighted average remaining service period |  |  |  |  |  |  |  |  |  | 7 years 8 months 12 days |  |  | 7 years 7 months 6 days |
Options vested, description |  |  |  |  |  |  |  |  |  |  |  |  |  | 612,500 options vest at a rate of 6.25% each quarter over 4 years.
Stock Option and Equity Incentive Plan One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of employees options |  |  |  |  |  | The Company granted a consultant options to purchase a total of 10,000 shares of common stock. The options have a ten-year term and have an exercise price of $43.47 and vest immediately. The options have an aggregate fair value of $338,992 calculated using the Black-Scholes option-pricing model. Variables used in the Black-Scholes option-pricing model include: (1) discount rate of 1.73% (2) expected life of 5 years, (3) expected volatility of 107.4%, and (4) zero expected dividends. |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  | 1.73% |  |  |  |  |  |  |  |
Expected life term |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Expected volatility rate |  |  |  |  |  | 107.40% |  |  |  |  |  |  |  |
Expected dividends rate |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per share |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.00
Weighted average fair value of options granted |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.60 |
Minimum [Member] | Stock-based compensation - warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per share |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00
Minimum [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.2
Discount rate |  |  |  |  |  |  |  |  |  | 1.73% |  |  | 2.37% | 2.14%
Expected life term |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Expected volatility rate |  |  |  |  |  |  |  |  |  | 107.40% |  |  | 101.50% | 99.90%
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per share |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.60
Weighted average fair value of options granted |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.84 |
Maximum [Member] | Stock-based compensation - warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per share |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.60
Maximum [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.52
Discount rate |  |  |  |  |  |  |  |  |  | 1.79% |  |  | 2.69% | 2.61%
Expected life term |  |  |  |  |  |  |  |  |  | 6 years 2 months 30 days |  |  |  |
Expected volatility rate |  |  |  |  |  |  |  |  |  | 108.20% |  |  | 102.30% | 101.60%
Placement Agent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate fair value of options |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,809,535 |
Warrants issued to placement agent, share |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected life term |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Expected dividends rate |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |
Placement Agent [Member] | Stock-based compensation - warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued to note holders |  |  |  |  |  |  |  |  |  |  |  |  |  | 201,000
Placement Agent [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per share |  |  |  |  |  |  |  |  |  | $ 3.96 |  |  |  |
Discount rate |  |  |  |  |  |  |  |  |  |  |  |  | 1.74% |
Expected volatility rate |  |  |  |  |  |  |  |  |  |  |  |  | 100.70% |
Placement Agent [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per share |  |  |  |  |  |  |  |  |  | $ 9.00 |  |  |  |
Discount rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.09% |
Expected volatility rate |  |  |  |  |  |  |  |  |  |  |  |  | 103.40% |
Contractor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate fair value of options | $ 121,252 |  |  | $ 112,183 |  |  | $ 41,386 | $ 93,762 |  |  |  |  |  |
Number of options granted | 15,000 |  |  | 30,000 |  |  | 6,250 | 25,000 |  |  |  |  |  |
Stock options term, description | 10-year term |  |  | Ten year term. |  |  | 10-year term | Ten year term. |  |  |  |  |  |
Options exercise price | $ 8.80 |  |  |  |  |  | $ 8.80 | $ 4.60 |  |  |  | $ 4.60 |  |
Discount rate | 1.36% |  |  | 2.49% |  |  | 1.68% | 2.69% |  |  |  |  |  |
Expected life term | 5 years |  |  | 6 years 2 months 30 days |  |  | 5 years | 6 years 2 months 30 days |  |  |  |  |  |
Expected volatility rate | 100.00% |  |  | 102.00% |  |  | 101.10% | 102.30% |  |  |  |  |  |
Expected dividends rate | 0.00% |  |  | 0.00% |  |  | 0.00% | 0.00% |  |  |  |  |  |
Consultant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate fair value of options |  |  | $ 95,131 |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  | 17,857 |  |  |  |  |  |  |  |  |  |  |
Stock options term, description |  |  | 5-year term. |  |  |  |  |  |  |  |  |  |  |
Options exercise price |  |  | $ 7.00 |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  | 2.42% |  |  |  |  |  |  |  |  |  |  |
Expected life term |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Expected volatility rate |  |  | 102.00% |  |  |  |  |  |  |  |  |  |  |
Expected dividends rate |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |
Investors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate fair value of options |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,420,300 |
Warrant, granted |  |  |  |  |  |  |  |  |  |  |  |  | 2,260,860 |
Investors [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per share |  |  |  |  |  |  |  |  |  |  | $ 6.00 |  | $ 6.00 |
Discount rate |  |  |  |  |  |  |  |  |  |  |  |  | 1.74% |
Expected life term |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Expected volatility rate |  |  |  |  |  |  |  |  |  |  |  |  | 100.70% |
Expected dividends rate |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |
Investors [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per share |  |  |  |  |  |  |  |  |  |  | $ 9.00 |  | $ 9.00 |
Discount rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.09% |
Expected volatility rate |  |  |  |  |  |  |  |  |  |  |  |  | 103.40% |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for consulting services, shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,750
Common stock for issuances of restricted common stocks |  |  |  |  |  |  |  |  |  | 0 |  |  | 0 | 938

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