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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