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Rent Expense (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Rent Expense [Line Items]    
Rent expense $ 650,000 $ 650,000
Auburn, Washington
    
Rent Expense [Line Items]    
Rent expense 27,000  
Lease Expiration Date Month to Month  
Baton Rouge, Louisiana
    
Rent Expense [Line Items]    
Rent expense 15,000  
Lease Expiration Date Feb. 28, 2015  
Champaign, Illinois
    
Rent Expense [Line Items]    
Rent expense 327,000  
Lease Expiration Date Dec. 31, 2014  
Charlotte, North Carolina
    
Rent Expense [Line Items]    
Rent expense 62,000  
Lease Expiration Date Mar. 31, 2016  
Hampstead, New Hampshire
    
Rent Expense [Line Items]    
Rent expense 28,000  
Lease Expiration Date Aug. 31, 2017  
Pearl River, New York
    
Rent Expense [Line Items]    
Rent expense 93,000  
Lease Expiration Date Aug. 31, 2018  
Pottsboro, Texas
    
Rent Expense [Line Items]    
Rent expense 18,000  
Lease Expiration Date Aug. 31, 2014  
Stony Point, NY
    
Rent Expense [Line Items]    
Rent expense 116,000  
Lease Expiration Date Jun. 30, 2016  
Tulsa, Oklahoma
    
Rent Expense [Line Items]    
Rent expense $ 26,000  
Lease Expiration Date Dec. 31, 2014