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Stockholders' Equity - Common Stock (Details) - USD ($)
 2 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 17, 2021
Oct. 23, 2020
Oct. 02, 2020
Sep. 30, 2020
Jun. 16, 2020
Sep. 21, 2018
Feb. 17, 2021
Dec. 31, 2018
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Mar. 16, 2020
Common Stock [Abstract]                        
Common stock issued, value                     $ 2,208,000  
Proceeds from sale of common stock                   $ 4,007,000 15,964,000  
Sale/Issuance of common stock                     $ 2,208,000  
Common Stock [Member]                        
Common Stock [Abstract]                        
Common stock issued (in shares)                     184,666  
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member]                        
Common Stock [Abstract]                        
Common stock issued, value           $ 5,000,000            
Period exercisable from the date of issuance           24 months            
Common stock issued (in shares)                     32,170  
Proceeds from sale of common stock                     $ 300,000  
Remaining availability under financing facility                   $ 0    
Sale/Issuance of common stock           $ 5,000,000            
Common Stock [Member] | Canaccord Genuity LLC [Member]                        
Common Stock [Abstract]                        
Common stock issued (in shares)                   1,616,331    
Proceeds from sale of common stock   $ 10,000,000               $ 3,200,000    
Remaining availability under financing facility   0                    
Common Stock [Member] | Canaccord Genuity LLC [Member] | Subsequent Event [Member]                        
Common Stock [Abstract]                        
Common stock issued (in shares) 536,070                      
Proceeds from sale of common stock $ 1,500,000                      
Common Stock [Member] | Purchase Agreement [Member] | Lincoln Park Capital Fund, LLC [Member]                        
Common Stock [Abstract]                        
Common stock issued (in shares)               12,802        
Proceeds from sale of common stock               $ 300,000        
Common Stock [Member] | 2020 Repurchase Agreement [Member]                        
Common Stock [Abstract]                        
Common stock issued, value                 $ 25,000,000      
Period exercisable from the date of issuance                 36 months      
Common stock issued (in shares)     180,701           0 353,113    
Proceeds from sale of common stock                   $ 700,000    
Sale/Issuance of common stock                 $ 25,000,000      
Closing price per share                       $ 1.05
Fair value of commitment fee     $ 500,000                  
Common Stock [Member] | 2020 Repurchase Agreement [Member] | Subsequent Event [Member]                        
Common Stock [Abstract]                        
Common stock issued (in shares) 985,186                      
Proceeds from sale of common stock $ 2,900,000                      
Common Stock [Member] | 2020 Repurchase Agreement [Member] | Commitment Fee                        
Common Stock [Abstract]                        
Common stock issued (in shares)                   180,701    
Common Stock [Member] | 2020 Repurchase Agreement [Member] | Minimum [Member] | Single Regular Purchase [Member]                        
Common Stock [Abstract]                        
Common stock issued, value       $ 500,000                
Common stock issued (in shares)       50,000                
Sale/Issuance of common stock       $ 500,000                
Common Stock [Member] | 2020 Repurchase Agreement [Member] | Maximum [Member]                        
Common Stock [Abstract]                        
Common stock issued (in shares)         23,800,000              
Percentage issuance of common stock         19.99%              
Common Stock [Member] | 2020 Repurchase Agreement [Member] | Maximum [Member] | Single Regular Purchase [Member]                        
Common Stock [Abstract]                        
Common stock issued (in shares)       100,000                
Closing price per share       $ 0.25         $ 0.25      
Common Stock [Member] | 2020 Repurchase Agreement [Member] | Lincoln Park Capital Fund, LLC [Member]                        
Common Stock [Abstract]                        
Common stock issued, value       $ 25,000,000                
Period exercisable from the date of issuance       36 months                
Common stock issued (in shares)                   353,113    
Proceeds from sale of common stock                   $ 700,000    
Sale/Issuance of common stock       $ 25,000,000                
Common Stock [Member] | 2020 Repurchase Agreement [Member] | Lincoln Park Capital Fund, LLC [Member] | Subsequent Event [Member]                        
Common Stock [Abstract]                        
Common stock issued (in shares)             985,186          
Proceeds from sale of common stock             $ 2,900,000          
Common Stock [Member] | Sales Agreement [Member] | Canaccord Genuity LLC [Member] | At The Market Offering Program [Member]                        
Common Stock [Abstract]                        
Remaining availability under financing facility   0                    
Common Stock [Member] | Sales Agreement [Member] | Canaccord Genuity LLC [Member] | Maximum [Member] | At The Market Offering Program [Member]                        
Common Stock [Abstract]                        
Proceeds from sale of common stock   $ 10,000,000