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Liquidity and Going Concern - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 23, 2020
Sep. 30, 2020
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Dec. 31, 2020
Liquidity [Line Items]            
Net loss     $ (2,720,000) $ (1,087,000)    
Accumulated deficit     (436,231,000)     $ (433,511,000)
Net cash used in operating activities     $ (3,006,000) (1,502,000)    
Substantial doubt about going concern, description     These factors raise substantial doubt about the Company’s ability to continue as a going concern.      
Proceeds from sale of common stock     $ 7,180,000 $ 0    
Sale of common stock, net     $ 7,078,000      
Common Stock [Member]            
Liquidity [Line Items]            
Common stock issued (in shares)     2,534,879,000      
Sale of common stock, net     $ 2,000      
Underwriter [Member] | Common Stock [Member]            
Liquidity [Line Items]            
Proceeds from sale of common stock     $ 3,200,000     $ 3,200,000
Common stock issued (in shares)     1,137,193     1,616,331
Canaccord Genuity LLC [Member] | Common Stock [Member]            
Liquidity [Line Items]            
Proceeds from sale of common stock $ 10,000,000   $ 3,200,000     $ 3,200,000
Remaining availability under financing facility $ 0          
Common stock issued (in shares)     1,137,193     1,616,331
Lincoln Park Capital Fund, LLC [Member] | Common Stock [Member] | 2020 Repurchase Agreement [Member]            
Liquidity [Line Items]            
Proceeds from sale of common stock     $ 3,900,000     $ 700,000
Common stock issued (in shares)     1,397,686     353,113
Sale of common stock, net   $ 25,000,000     $ 25,000,000  
Period exercisable from the date of issuance   36 months     36 months