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Notes Payable - Additional Information (Detail) (Revolving Credit Facility One [Member], USD $)
 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Line of Credit Facility [Line Items]    
Revolving credit line $ 10,000,000  
Borrowed under the agreement 500,000 500,000
Additional borrowings available based on Company's borrowing 4,900,000  
Revolving credit agreement maturity date Jul. 01, 2014  
Net profitability test $ 1  
Leverage test of total liabilities to total net worth 1.0  
Current ratio 2.0  
Credit facility's interest rate, Description Credit facility’s interest rate is LIBOR (0.19% at June 30, 2013) plus 3.25% per annum  
Commitment fee of the unused portion of the credit 0.30%  
London Interbank Offered Rate (LIBOR) [Member]
    
Line of Credit Facility [Line Items]    
Credit facility's interest rate 3.25%  
Credit facility LIBOR 0.19%