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Long-term Debt (Detail) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Long-Term Debt, Gross $ 0 $ 3,338,000
Less current portion 0 225,000
Long-term debt, net of current portion 0 3,113,000
Ten Year Term With Merrill Lynch One
   
Debt Instrument [Line Items]    
Long-Term Debt, Gross 0 2,225,000
Long-term debt, net of current portion 3,000,000  
Ten Year Term With Merrill Lynch Two
   
Debt Instrument [Line Items]    
Long-Term Debt, Gross 0 1,113,000
Long-term debt, net of current portion $ 1,500,000