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Stock Based Compensation (Narrative) (Detail) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 15, 2015
Dec. 06, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense     $ 454 $ 4,514    
Unrecognized stock-based compensation cost $ 3,044   $ 3,044      
Restricted stock | Employees            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock granted, shares     82 424    
Restricted stock, vesting period     3 years 3 years    
Restricted stock | Non-employee directors            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock granted, shares       27    
Restricted stock, vesting period       1 year    
Performance-vested restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock granted, shares       203    
Upper limit of target grant, shares       355    
Performance-vested restricted stock units, vesting percentage       100.00%    
Restricted common stock and restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense $ 462 $ 1,363 $ 438 $ 4,495    
Restricted common stock and restricted stock units | Chief executive officer            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense       $ 2,017    
2015 Equity Participation Plan (the "2015 Plan")            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares of common stock that may be issued         4,250  
2010 Equity Participation Plan (as amended and restated in 2012, the "2010 Plan")            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares of common stock that may be issued           5,250