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Stockholders' Equity - Warrants (Details) - USD ($)
 3 Months Ended 9 Months Ended
Apr. 27, 2018
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Dec. 31, 2020
Class of Stock [Line Items]          
Warrant exercise price (in dollars per share)       $ 2.25  
Warrant liability   $ 5,000     $ 7,000
Change in fair value of warrants   $ (2,000) $ (1,667,000)    
Outstanding Warrants [Member]          
Class of Stock [Line Items]          
Warrant liability       $ 4,500,000  
Change in fair value of warrants       $ 700,000  
Series U Warrants [Member]          
Class of Stock [Line Items]          
Common stock issued (in shares)   3,450,000      
Sale of Stock, Price Per Share   $ 5.00      
Warrants expected term   5 years      
Representative Warrants [Member]          
Class of Stock [Line Items]          
Number of securities called by warrant or right   75,000      
Warrant exercise price (in dollars per share)   $ 6.25      
Warrant exercise price decrease       $ 2.81  
Common Stock [Member]          
Class of Stock [Line Items]          
Common stock issued (in shares)   2,534,879,000      
Warrants expected term   5 years      
Common Class A [Member]          
Class of Stock [Line Items]          
Common stock issued (in shares)   289,000      
Common Class B [Member]          
Class of Stock [Line Items]          
Number of securities called by warrant or right   2,711,000      
2018 Rights Offering [Member]          
Class of Stock [Line Items]          
Number of securities called by warrant or right 1        
2018 Rights Offering [Member] | Outstanding Warrants [Member]          
Class of Stock [Line Items]          
Number of securities called by warrant or right 1,050        
Warrant exercise price (in dollars per share) $ 1,000        
2018 Rights Offering [Member] | Common Stock and Series B Convertible Preferred Stock [Member]          
Class of Stock [Line Items]          
Charge on Non Transferable Subscription Rights $ 0        
2018 Rights Offering [Member] | Series C Convertible Preferred Stock [Member]          
Class of Stock [Line Items]          
Number of securities called by warrant or right 20,000        
Series U Warrants [Member] | Outstanding Warrants [Member]          
Class of Stock [Line Items]          
Number of securities called by warrant or right       3,447,500  
Class of warrant outstanding   2,141,000      
Number of warrants exercised   2,141,000