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Subsequent Events (Details) - USD ($)
1 Months Ended
May 01, 2020
May 12, 2020
Apr. 30, 2020
Apr. 22, 2020
Mar. 31, 2020
Dec. 31, 2019
Subsequent Event [Line Items]            
Grants receivable         $ 428,000  
Common stock, shares issued (in shares)         24,700,553 19,683,401
Subsequent Event            
Subsequent Event [Line Items]            
Revenue from grant for notice of award     $ 731,000      
Grants receivable     1,900,000      
Loan under Paycheck Protection Program     $ 367,000      
Interest rate     1.00%      
Obligation to purchase common stock       $ 15,000,000    
Stock registered for resale (up to) 7,500,000          
Subsequent Event | ATM Sales            
Subsequent Event [Line Items]            
Common stock, shares issued (in shares)   1,864,485        
Aggregate net proceeds on sales of shares of common stock   $ 2,000,000