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Share-Based Compensation - Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Sep. 30, 2018
Sep. 30, 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) 0    
Shares Awarded, Exercised/Released (in shares) 0    
Shares Awarded, Cancelled/Forfeited (in shares) 0    
Shares Awarded, Ending balance (in shares) 14,958    
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) 0.00    
Weighted Average Grant Date Fair Value, Exercised/Released (in US$ per share) 0.00    
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) $ 33.48    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Weighted Average Remaining Life, Beginning balance 4 months 24 days 1 year 8 months 12 days  
Weighted Average Remaining Life, Ending balance 4 months 24 days 1 year 8 months 12 days  
Aggregate Intrinsic Value, Beginning Balance $ 457    
Aggregate Intrinsic Value, Granted 0    
Aggregate Intrinsic Value, Exercised/Released 0    
Aggregate Intrinsic Value, Cancelled/Forfeited 0    
Aggregate Intrinsic Value, Ending Balance $ 395    
Vested and Expected to Vest, Outstanding, Number (in shares) 14,663    
Vested and Expected to Vest, Weighted Average Exercise Price (in US$ per share) $ 33.50    
Vested and Expected to Vest, Weighted Average Remaining Life 4 months 24 days    
Vested and Expected to Vest, Aggregate Intrinsic Value $ 387    
Performance-Based Restricted Stock Units (PBRSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense recognized 82 $ 0  
Unrecognized compensation cost related to restricted stock 800   $ 900
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to restricted stock 100   $ 300
General and Administrative Expense | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense recognized $ 103 $ 33