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Share-Based Compensation - Restricted Stock Activity (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2016
Jun. 30, 2017
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Restricted stock granted (in shares) 0      
Shares Awarded, Exercised/Released (in shares) 0      
Shares Awarded, Cancelled/Forfeited (in shares) (2,732)      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Restricted stock granted, weighted average grant date fair value (in US$ 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) $ 24.41      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Aggregate Intrinsic Value, Exercised/Released $ 0      
Aggregate Intrinsic Value, Granted 0      
Aggregate Intrinsic Value, Cancelled/Forfeited $ 0      
Restricted Stock | Vested        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Shares Awarded, Beginning balance (in shares) 15,445      
Shares Awarded, Ending balance (in shares) 12,713      
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) $ 29.79      
Weighted Average Grant Date Fair Value, Ending balance (in US$ per share) $ 30.94      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Weighted Average Remaining Life, Beginning balance 7 months 6 days   11 months 12 days  
Weighted Average Remaining Life, Ending balance 7 months 6 days   11 months 12 days  
Aggregate Intrinsic Value, Beginning Balance $ 467,000      
Aggregate Intrinsic Value, Ending Balance $ 418,000      
Vested and Expected to Vest, Outstanding, Number (in shares) 12,493      
Vested and Expected to Vest, Weighted Average Exercise Price (in US$ per share) $ 30.94      
Vested and Expected to Vest, Weighted Average Remaining Life 7 months 6 days      
Vested and Expected to Vest, Aggregate Intrinsic Value $ 410,000      
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost related to restricted stock 200,000     $ 300,000
General and Administrative Expense | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense recognized $ 0 $ 60,000