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Commitments and Contingencies - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended
Dec. 31, 2012
sqft
Aug. 31, 2011
sqft
May 31, 2013
May 31, 2012
May 31, 2011
Commitments and Contingencies Disclosure [Line Items]          
Environmental remediation expense, period of remediation, years     5 years    
Estimated liability costs of remediation     $ 916,000 $ 916,000  
Estimated liability, measurement period, years     15 years    
Purchase price of acquired facility 1,500,000 4,950,000      
Additional office, production and warehouse space 36,000 128,000      
Future expected lease rental income, 2014     104,000    
Future expected lease rental income, 2015     38,000    
Future expected lease rental income, 2016     3,000    
Royalty Expense     1,837,000 1,371,000 1,561,000
Guaranteed minimum royalty payment for period, 2014     907,000    
Guaranteed minimum royalty payment for period, 2015     1,007,000    
Guaranteed minimum royalty payment for period, 2016     1,157,000    
Guaranteed minimum royalty payment for period, 2017 and later     1,157,000    
Office and Manufacturing facilities operating lease expense     657,000 495,000 477,000
Future minimum rental payments for 2014     467,000    
Future minimum rental payments for 2015     247,000    
Future minimum rental payments for 2016     247,000    
Future minimum rental payments for 2017 and later     843,000    
Minimum
          
Commitments and Contingencies Disclosure [Line Items]          
Environmental remediation expense     50,000    
Maximum
          
Commitments and Contingencies Disclosure [Line Items]          
Environmental remediation expense     $ 105,000