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Stockholders' Equity - Common stock (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jan. 14, 2022
Jun. 16, 2020
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Sep. 30, 2020
Dec. 31, 2021
Oct. 23, 2020
Class of Stock [Line Items]                      
Sale of common stock, net     $ 152,000 $ 7,742,000 $ 5,094,000 $ 7,078,000          
Proceeds from sale of common stock, net             $ 7,725,000 $ 12,291,000      
Common Stock [Member]                      
Class of Stock [Line Items]                      
Sale of common stock, net       $ 6,000 $ 2,000 $ 2,000          
Common stock issued (in shares)     271,047 6,687,610 1,907,000 2,534,879          
2020 Purchase Agreement [Member] | Lincoln Park Capital Fund, LLC [Member] | Common Stock [Member]                      
Class of Stock [Line Items]                      
Sale of common stock, net                 $ 25,000,000.0    
Common stock issued (in shares)             5,665,000     5,685,186  
Period exercisable from the date of issuance                 36 months    
Closing price per share   $ 1.05                  
Proceeds from sale of common stock, net             $ 7,000,000.0     $ 12,500,000  
Remaining common stock issued and sold (in shares)     0       0        
2020 Purchase Agreement [Member] | Lincoln Park Capital Fund, LLC [Member] | Common Stock [Member] | Minimum [Member]                      
Class of Stock [Line Items]                      
Percentage issuance of common stock   19.99%                  
2020 Purchase Agreement [Member] | Lincoln Park Capital Fund, LLC [Member] | Common Stock [Member] | Maximum [Member]                      
Class of Stock [Line Items]                      
Common stock issued (in shares)   23,800,000                  
Sales Agreement [Member] | Canaccord Genuity LLC [Member] | Common Stock [Member] | At The Market Offering Program [Member]                      
Class of Stock [Line Items]                      
Remaining availability under financing facility $ 0                   $ 0
Sales Agreement [Member] | Canaccord Genuity LLC [Member] | Common Stock [Member] | Maximum [Member] | At The Market Offering Program [Member]                      
Class of Stock [Line Items]                      
Proceeds from sale of common stock, net $ 5,000,000                    
2022 Distribution Agreement [Member] | Canaccord Genuity LLC [Member] | Common Stock [Member]                      
Class of Stock [Line Items]                      
Common stock issued (in shares)             1,293,657        
Proceeds from sale of common stock, net             $ 900,000        
2020 Distribution Agreement [Member] | Canaccord Genuity LLC [Member] | Common Stock [Member]                      
Class of Stock [Line Items]                      
Common stock issued (in shares)                   2,179,193  
Proceeds from sale of common stock, net                   $ 6,300,000