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Stockholders' Equity - Common Stock Issuances - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended
May 05, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Stockholders Equity Note [Line Items]                  
Warrant exercise price   $ 10.00         $ 10.00    
Net proceeds from Public Offering $ 22,000,000           $ 19,377,000 $ 0  
Conversion of Preferred stock into common stock             2,000,224    
Exercise of pre-funded Series D Warrants (in shares)             6,000    
Stock Issued During Period Shares associated other warrants             60,117    
Common stock shares issued             72,976    
Remaining Warrants exercise price   10.00         $ 10.00    
Deemed dividend for triggering of warrant down round feature             $ (55,000)    
Series F warrants [Member]                  
Stockholders Equity Note [Line Items]                  
Warrants issued to purchase of common stock 2,224,900                
Warrant exercise price $ 10.00                
Warrants issued to purchase of common stock 2,224,900                
Remaining Warrants exercise price $ 10.00                
Pre-Funded Warrants [Member]                  
Stockholders Equity Note [Line Items]                  
Warrants issued to purchase of common stock 377,000                
Warrants issued to purchase of common stock 377,000                
Common Stock [Member]                  
Stockholders Equity Note [Line Items]                  
Warrants issued to purchase of common stock             371,000    
Warrant exercise price   $ 0.01         $ 0.01    
Warrants issued to purchase of common stock             371,000    
Net proceeds from Public Offering $ 21,996,000                
Conversion of Preferred stock into common stock   447,700 1,549,609 2,915          
Exercise of pre-funded Series D Warrants (in shares)     6,000   5,399 5,885      
Remaining Warrants exercise price   $ 0.01         $ 0.01    
Common Stock [Member] | IPO [Member]                  
Stockholders Equity Note [Line Items]                  
Shares issued in public offering 1,823,000                
2019 Warrants [Member]                  
Stockholders Equity Note [Line Items]                  
Warrant exercise price $ 10.00               $ 23.04
Net proceeds from Public Offering $ 21,996,000                
Remaining Warrants exercise price $ 10.00               $ 23.04
Deemed dividend for triggering of warrant down round feature $ 54,500