v2.4.0.8
Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Segment
Customer
Distributor
Dec. 31, 2012
Customer
Dec. 31, 2011
Customer
Significant Accounting Policies [Line Items]      
Reserves for excess and obsolete inventory $ 1,454,000 $ 1,439,000  
Number of Operating Segments 1    
Number Of Distribution Centers 17    
Number Of Customer Accounted For Ten Percent Or More Net Sales 0 0 0
Level 3 assets 0 0  
Level 3 liabilities 0 0  
Warranty period for retail customer 24 months    
Warranty reserves $ 737,000 $ 690,000  
Stock Option
      
Significant Accounting Policies [Line Items]      
Anti-dilutive shares excluded from the computation of diluted loss per share 279,000 433,000 546,001
Restricted Stock
      
Significant Accounting Policies [Line Items]      
Anti-dilutive shares excluded from the computation of diluted loss per share 318,660 312,501 232,501
Leasehold Improvements | Minimum
      
Significant Accounting Policies [Line Items]      
Leasehold improvements amortization Period 5 years    
Leasehold Improvements | Maximum
      
Significant Accounting Policies [Line Items]      
Leasehold improvements amortization Period 15 years