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Stockholders' Equity - Common stock (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Oct. 23, 2020
Sep. 30, 2020
Jun. 16, 2020
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2020
Class of Stock [Line Items]                  
Sale of common stock, net       $ 5,094,000 $ 7,078,000        
Proceeds from sale of common stock, net           $ 12,291,000 $ 0    
Common Stock [Member]                  
Class of Stock [Line Items]                  
Sale of common stock, net       $ 2,000 $ 2,000        
Common stock issued (in shares)       1,907,000,000 2,534,879,000        
Lincoln Park Capital Fund, LLC [Member] | Common Stock [Member]                  
Class of Stock [Line Items]                  
Sale of common stock, net               $ 25,000,000.0  
Period exercisable from the date of issuance               36 months  
Lincoln Park Capital Fund, LLC [Member] | 2020 Repurchase Agreement [Member] | Common Stock [Member]                  
Class of Stock [Line Items]                  
Sale of common stock, net   $ 25,000,000.0              
Common stock issued (in shares)           2,262,686     353,113
Period exercisable from the date of issuance   36 months              
Closing price per share     $ 1.05            
Proceeds from sale of common stock, net           $ 6,000,000.0     $ 700,000
Lincoln Park Capital Fund, LLC [Member] | 2020 Repurchase Agreement [Member] | Common Stock [Member] | Commitment Fee                  
Class of Stock [Line Items]                  
Common stock issued (in shares)                 180,701
Lincoln Park Capital Fund, LLC [Member] | 2020 Repurchase Agreement [Member] | Common Stock [Member] | Minimum [Member]                  
Class of Stock [Line Items]                  
Percentage issuance of common stock     19.99%            
Lincoln Park Capital Fund, LLC [Member] | 2020 Repurchase Agreement [Member] | Common Stock [Member] | Minimum [Member] | Single Regular Purchase [Member]                  
Class of Stock [Line Items]                  
Sale of common stock, net   $ 500,000              
Common stock issued (in shares)   50,000              
Lincoln Park Capital Fund, LLC [Member] | 2020 Repurchase Agreement [Member] | Common Stock [Member] | Maximum [Member]                  
Class of Stock [Line Items]                  
Common stock issued (in shares)     23,800,000            
Lincoln Park Capital Fund, LLC [Member] | 2020 Repurchase Agreement [Member] | Common Stock [Member] | Maximum [Member] | Single Regular Purchase [Member]                  
Class of Stock [Line Items]                  
Common stock issued (in shares)   100,000              
Closing price per share   $ 0.25           $ 0.25  
Canaccord Genuity LLC [Member] | Common Stock [Member]                  
Class of Stock [Line Items]                  
Common stock issued (in shares)           2,179,193     1,616,331
Proceeds from sale of common stock, net $ 10,000,000         $ 6,300,000     $ 3,200,000
Remaining availability under financing facility 0                
Canaccord Genuity LLC [Member] | Sales Agreement | Common Stock [Member] | At The Market Offering Program                  
Class of Stock [Line Items]                  
Remaining availability under financing facility $ 0                
Canaccord Genuity LLC [Member] | Distribution Agreement [Member] | Common Stock [Member]                  
Class of Stock [Line Items]                  
Remaining availability under financing facility       $ 0   $ 0