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Share-Based Compensation - Performance-Based RSUs (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2019
Mar. 31, 2019
Mar. 31, 2018
Jun. 30, 2018
Performance-Based Restricted Stock Units (PBRSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 1,700 $ 1,700   $ 900
Number of PBRSUs [Roll Forward]        
Compensation expense recognized $ 149 $ 344 $ 100  
Performance-Based Restricted Stock Units (PBRSUs)        
Number of PBRSUs [Roll Forward]        
Shares Awarded, Beginning balance (in shares)   35,732    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   47,928    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period   2,889    
Shares Awarded, Ending balance (in shares) 80,771 80,771    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 27.78 $ 27.78   $ 31.70
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   25.04    
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)   $ 30.67    
Vested and Expected to Vest, Outstanding, Number (in units) 73,095 73,095    
Vested and Expected to Vest, Weighted Average Exercise Price (in US$ per share) $ 27.34 $ 27.34    
2017 Plan [Member] | Performance-Based Restricted Stock Units (PBRSUs)        
Number of PBRSUs [Roll Forward]        
Employee Service Share-based Compensation, Nonvested Awards, Weighted Average Remaining Amortization Period 2 years 2 months 12 days