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Stock-Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2015
Dec. 02, 2014
Sep. 24, 2014
Sep. 24, 2013
Sep. 24, 2012
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
May. 22, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares available for grant           1,295,814 1,295,814   1,295,814  
Maximum tenure of stock option from the date of grant             10 years      
Exercisable period of vested awards             30 days      
Shares granted to employees and directors   1,326,923 359,000 0 0   0 359,000    
Stock options expiration date     Sep. 24, 2017              
Fair value of option granted   $ 3.19 $ 2.70       $ 2.70      
Unrecognized stock compensation expense           $ 25,000 $ 25,000      
Unrecognized stock compensation expense, period             3 months      
Stock-based compensation expense           $ 423,000 $ 1,900,000      
Employee Stock Option [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock options expiration date   Dec. 02, 2017                
Director Stock Options [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock options expiration date   Dec. 02, 2017                
Share-based Compensation Award, Tranche One [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Percentage of vesting of awards granted   50.00%                
Share-based Compensation Award, Tranche Two [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Percentage of vesting of awards granted 50.00%                  
Minimum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock options, Vesting period             1 year      
Fair value of option granted                 $ 3.07  
Maximum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock options, Vesting period             5 years      
Fair value of option granted                 $ 3.54  
Omnibus Incentive Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common stock reserved for issuance                   2,981,737
Shares available for grant           1,295,814 1,295,814   1,295,814