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Stock Based Compensation (Narrative) (Detail) - USD ($)
shares in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2018
Sep. 30, 2017
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Jun. 30, 2017
Dec. 15, 2015
Dec. 06, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock-based compensation expense         $ 6,442 [1] $ 5,239      
Total unrecognized stock-based compensation cost $ 7,864   $ 7,864   $ 7,864        
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
Restricted stock | Employees                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock granted, shares         490   277    
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   22    
Restricted stock, vesting period         1 year   1 year    
Restricted stock units | Employees                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock granted, shares             42    
Performance-vested restricted stock units                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock granted, shares         203   160    
Restricted stock, vesting period         3 years   3 years    
Upper limit of target grant, shares         355   280    
Performance-vested restricted stock units, vesting percentage at the end of third year         100.00%   100.00%    
Restricted common stock and restricted stock units                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock-based compensation expense     $ 1,931 $ 1,506 $ 6,426 $ 5,213      
Restricted common stock and restricted stock units | Chief financial officer                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock-based compensation expense $ 431                
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              
[1] (as restated)