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Stock-Based Compensation (Summarized Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Outstanding, Number of shares, Beginning Balance   1,331,651 864,579 864,579  
Granted, Number of shares     561,000    
Exercised   (5,834)      
Forfeitures, Number of shares   (456,033)      
Outstanding, Number of shares, Ending Balance 1,425,579 1,579,784 1,425,579 1,331,651 864,579
Exercisable, Number of Shares   472,299      
Vested and expected to vest, Number of shares   1,579,784      
Outstanding, Weighted average exercise price, Beginning Balance   $ 5.83 $ 7.81 $ 7.81  
Granted, Weighted average exercise price     3.07    
Exercised, weighted average exercise price   3.07      
Forfeitures, Weighted average exercise price   7.03      
Outstanding, Weighted average exercise price, Ending Balance $ 5.94 4.28 $ 5.94 $ 5.83 $ 7.81
Exercisable, Weighted average exercise price   6.37      
Vested and expected to vest, Weighted average exercise price   $ 4.28      
Outstanding, Weighted average remaining contractual term (in years) 7 years 9 months 21 days 8 years 14 days   7 years 6 months 21 days 7 years 18 days
Granted, Weighted average remaining contractual term (in years)     10 years    
Exercisable, Weighted average remaining contractual term (in years)   7 years 2 months 1 day      
Vested and expected to vest, Weighted average remaining contractual term (in years)   8 years 14 days      
Vested and expecting to vest, Aggregate intrinsic value   $ 2,104      
Outstanding, Aggregate intrinsic value, Beginning Balance   0      
Granted, Aggregate intrinsic value $ 676   $ 676    
Exercised, Aggregate intrinsic value   21      
Exercisable, Aggregate intrinsic value   274      
Outstanding, Aggregate intrinsic value, Ending Balance $ 365 $ 2,104 $ 365 $ 0  
Outstanding, Weighted average grant date fair value, Beginning Balance   $ 2.01 $ 2.62 $ 2.62  
Granted, Weighted average grant date fair value     1.20    
Exercised, Weighted average grant date fair value   0      
Forfeitures, Weighted average grant date fair value   2.26      
Outstanding, Weighted average grant date fair value, Ending Balance $ 2.07 $ 1.59 $ 2.07 $ 2.01 $ 2.62
August 2020 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted, Number of shares   150,000      
Granted, Weighted average exercise price   $ 3.50      
Granted, Weighted average remaining contractual term (in years)   3 years      
Granted, Aggregate intrinsic value   $ 166      
Granted, Weighted average grant date fair value   $ 1.11      
November 2020 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted, Number of shares   560,000      
Granted, Weighted average exercise price   $ 3.01      
Granted, Weighted average remaining contractual term (in years)   10 years      
Granted, Aggregate intrinsic value   $ 691      
Granted, Weighted average grant date fair value   $ 1.23