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Long-Term Debt and Line of Credit - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Line of Credit Facility [Line Items]      
Interest paid relating to debt $ 12,000 $ 62,000 $ 89,000
Expiration date Jun. 02, 2014    
Debt instrument variable interest rate LIBOR rate plus 1.75%, which was 1.92%    
Bank Of America Libor Rate
      
Line of Credit Facility [Line Items]      
Line of credit facility remaining borrowing capacity $ 5,000,000