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Stock-Based Compensation (Details Narrative) - USD ($)
12 Months Ended
Feb. 19, 2019
Sep. 28, 2018
Dec. 31, 2019
Dec. 31, 2018
Unrecognized compensation cost related to non-vested stock based compensation     $ 1,600,000  
Stock based compensation cost expected to be recognized, weighted average period     1 year 1 month 6 days  
Research and Development Expense [Member]        
Compensation cost     $ 900,000 $ 1,500,000
General and Administrative Expense [Member]        
Compensation cost     1,400,000 3,100,000
Restricted Stock Awards [Member]        
Compensation cost     $ 4,600,000 $ 4,600,000
Equity Stock Awards [Member]        
Number of shares reserved for future issuance     4,130,886  
Inducement Awards [Member]        
Number of shares reserved for future issuance     210,006  
Stock Options [Member]        
Inducement option grant, exercise price per share     $ 2.00 $ 2.26
Compensation cost     $ 2,300,000 $ 2,300,000
2018 Stock Incentive Plan [Member]        
Equity awards, number of stock authorized     2,700,000  
Percentage of fair market value of shares     100.00%  
Percentage of outstanding stock determining factor for incentive stock price     10.00%  
Number of shares reserved for future issuance     4,580,893  
2018 Stock Incentive Plan [Member] | Minimum [Member]        
Number of equity awards available for future issuance     1,200,000  
Percentage of fair market value of shares     110.00%  
2018 Stock Incentive Plan [Member] | Maximum [Member]        
Number of equity awards available for future issuance     3,900,000  
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    
2007 Stock Incentive Plan [Member]        
Number of shares reserved for future issuance     450,007