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Stock-Based Compensation (Summarized Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding, Number of shares, Beginning Balance 1,294,832 1,331,651 1,331,651  
Granted, Number of shares   150,000    
Forfeitures, Number of shares (85,000) (250,034)    
Outstanding, Number of shares, Ending Balance 1,209,832 1,231,617 1,294,832 1,331,651
Exercisable, Number of Shares 401,677      
Vested and expected to vest, Number of shares 1,209,832      
Outstanding, Weighted average exercise price, Beginning Balance $ 3.93 $ 5.83 $ 5.83  
Granted, Weighted average exercise price   3.50    
Forfeitures, Weighted average exercise price 3.48 8.79    
Outstanding, Weighted average exercise price, Ending Balance 3.96 $ 4.97 $ 3.93 $ 5.83
Exercisable, Weighted average exercise price 5.18      
Vested and expected to vest, Weighted average exercise price $ 3.96      
Outstanding, Weighted average remaining contractual term (in years) 7 years 7 months 17 days 7 years 6 months 21 days 7 years 8 months 4 days 7 years 6 months 21 days
Granted, Weighted average remaining contractual term (in years)   3 years    
Exercisable, Weighted average remaining contractual term (in years) 6 years 5 months 1 day      
Vested and expected to vest, Weighted average remaining contractual term (in years) 7 years 7 months 17 days      
Vested and expecting to vest, Aggregate intrinsic value $ 1,445      
Outstanding, Aggregate intrinsic value, Beginning Balance 1,624 $ 0 $ 0  
Granted, Aggregate intrinsic value   166    
Exercisable, Aggregate intrinsic value 199      
Outstanding, Aggregate intrinsic value, Ending Balance $ 1,445 $ 163 $ 1,624 $ 0
Outstanding, Weighted average grant date fair value, Beginning Balance $ 1.45 $ 2.01 $ 2.01  
Granted, Weighted average grant date fair value   1.11    
Forfeitures, Weighted average grant date fair value 1.34 2.71    
Outstanding, Weighted average grant date fair value, Ending Balance $ 1.46 $ 1.76 $ 1.45 $ 2.01