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Stock-Based Compensation (Details Narrative) - USD ($)
3 Months Ended 9 Months Ended
Feb. 19, 2019
Sep. 28, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Unrecognized compensation cost related to non-vested stock based compensation     $ 1,600,000   $ 1,600,000  
Stock based compensation cost expected to be recognized, weighted average period         1 year 1 month 6 days  
Weighted average grant date fair value of stock option awards granted         $ 1.86 $ 2.36
Research and Development Expense [Member]            
Compensation cost     188,264 $ 211,947 $ 668,058 $ 1,335,136
General and Administrative Expenses [Member]            
Compensation cost     265,416 402,581    
General and Administrative Expense [Member]            
Compensation cost         1,099,464 2,650,693
Restricted Stock Awards [Member]            
Compensation cost     $ 614,528 614,528 $ 3,985,829 3,985,829
Weighted average grant date fair value of stock option awards granted         $ 2.07  
Equity Stock Awards [Member]            
Number of shares reserved for future issuance     4,580,893   4,580,893  
Inducement Awards [Member]            
Number of shares reserved for future issuance     246,506   246,506  
Stock Options [Member]            
Inducement option grant, exercise price per share         $ 2.14  
Compensation cost     $ 453,680 $ 453,680 $ 1,767,522 $ 1,767,522
2018 Stock Incentive Plan [Member]            
Equity awards, number of stock authorized     2,700,000   2,700,000  
Percentage of fair market value of shares     100.00%   100.00%  
Percentage of outstanding stock determining factor for incentive stock price     10.00%   10.00%  
Number of shares reserved for future issuance     3,726,386   3,726,386  
2018 Stock Incentive Plan [Member] | Minimum [Member]            
Number of equity awards available for future issuance     1,200,000   1,200,000  
Percentage of fair market value of shares     110.00%   110.00%  
2018 Stock Incentive Plan [Member] | Maximum [Member]            
Number of equity awards available for future issuance     3,900,000   3,900,000  
2007 Stock Incentive Plan [Member]            
Equity awards, number of stock authorized     688,531   688,531  
Number of shares reserved for future issuance     854,507   854,507  
Inducement Option Grants [Member] | Five New Employees [Member]            
Inducement option grant, exercise price per share $ 2.18 $ 2.77        
Option vested period 3 years 3 years        
Options expiration period 10 years 10 years        
Inducement Option Grants [Member] | Five New Employees [Member] | Restricted Stock Awards [Member]            
Number of shares issued 13,000 19,000        
Inducement Option Grants [Member] | Five New Employees [Member] | Common Stock [Member]            
Number of shares issued 140,004 164,004