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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, 2019
Sep. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Stock-Based Compensation [Abstract]        
Outstanding, Number of shares, Beginning Balance 864,579 809,274 809,274  
Granted, Number of shares   600,000    
Forfeitures, Number of shares   (200,000)    
Outstanding, Number of shares, Ending Balance 864,579 1,209,274 864,579 809,274
Exercisable, Number of Shares 523,914      
Vested and expected to vest, Number of shares 864,579      
Outstanding, Weighted average exercise price, Beginning Balance $ 7.81 $ 13.99 $ 13.99  
Granted, Weighted average exercise price   6.20    
Forfeitures, Weighted average exercise price   24.46    
Outstanding, Weighted average exercise price, Ending Balance 7.81 $ 8.41 $ 7.81 $ 13.99
Exercisable, Weighted average exercise price 8.86      
Vested and expected to vest, Weighted average exercise price $ 7.81      
Outstanding, Weighted average remaining contractual term (in years) 6 years 9 months 22 days 6 years 7 months 2 days 7 years 18 days 2 years 8 months 1 day
Granted, Weighted average remaining contractual term (in years)   10 years    
Exercisable, Weighted average remaining contractual term (in years) 2 years 5 months 9 days      
Vested and expected to vest, Weighted average remaining contractual term (in years) 6 years 9 months 22 days      
Outstanding, Aggregate intrinsic value, Beginning Balance   $ 370 $ 370  
Granted, Aggregate intrinsic value   1,212    
Outstanding, Aggregate intrinsic value, Ending Balance   $ 1,322   $ 370
Outstanding, Weighted average grant date fair value, Beginning Balance $ 2.62 $ 4.20 $ 4.20  
Granted, Weighted average grant date fair value   2.02    
Forfeitures, Weighted average grant date fair value   7.17    
Outstanding, Weighted average grant date fair value, Ending Balance $ 2.62 $ 2.62 $ 2.62 $ 4.20