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Share-Based Compensation - Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Restricted Stock          
Number of Restricted Stock [Roll Forward]          
Shares Awarded, Beginning balance (in shares)     14,958    
Restricted stock granted (in shares)     16,266    
Shares Awarded, Exercised/Released (in shares)     (12,722)    
Shares Awarded, Cancelled/Forfeited (in shares)     0    
Shares Awarded, Ending balance (in shares) 18,502   18,502    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]          
Weighted Average Grant Date Fair Value, Beginning balance (in US$ per share)     $ 33.48    
Restricted stock granted, weighted average grant date fair value (in US$ per share)     23.98    
Weighted Average Grant Date Fair Value, Exercised/Released (in US$ per share)     33.81    
Weighted Average Grant Date Fair Value, Cancelled/Forfeited (in US$ per share)     0.00    
Weighted Average Grant Date Fair Value, Ending balance (in US$ per share) $ 24.90   $ 24.90    
Weighted Average Remaining Life, Granted     10 months 24 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]          
Weighted Average Remaining Life, Beginning balance 1 year     1 year 8 months 12 days  
Weighted Average Remaining Life, Ending balance 1 year     1 year 8 months 12 days  
Aggregate Intrinsic Value, Beginning Balance     $ 457    
Aggregate Intrinsic Value, Granted     390    
Aggregate Intrinsic Value, Exercised/Released     315    
Aggregate Intrinsic Value, Cancelled/Forfeited     0    
Aggregate Intrinsic Value, Ending Balance $ 432   $ 432    
Vested and Expected to Vest, Outstanding, Number (in shares) 17,611   17,611    
Vested and Expected to Vest, Weighted Average Exercise Price (in US$ per share) $ 24.88   $ 24.88    
Vested and Expected to Vest, Weighted Average Remaining Life 1 year        
Vested and Expected to Vest, Aggregate Intrinsic Value $ 411   $ 411    
Performance-Based Restricted Stock Units (PBRSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense recognized 117 $ 48 199 $ 48  
Unrecognized compensation cost related to restricted stock 1,600   1,600   $ 900
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to restricted stock 400   400   $ 300
General and Administrative Expense | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense recognized $ 129   $ 237 $ 138