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Commitments and Contingencies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Commitments and Contingencies Disclosure [Line Items]    
Operating Leases, Rent Expense $ 113,000 $ 75,000
Operating Leases, Future Minimum Payments Due, Next Twelve Months 147,000  
Operating Leases, Future Minimum Payments, Due in Two Years 76,000  
Operating Leases, Future Minimum Payments, Due in Three Years 71,000  
Operating Leases, Future Minimum Payments, Due in Four Years 62,000  
Operating Leases, Future Minimum Payments, Due in Five Years 63,000  
Operating Leases, Rent Expense, Sublease Rentals 50,000  
Sub Rentals Two Thousand And Thirteen [Member]
    
Commitments and Contingencies Disclosure [Line Items]    
Operating Leases, Rent Expense, Sublease Rentals 37,000  
Texas Railroad Commission [Member]
    
Commitments and Contingencies Disclosure [Line Items]    
Letters of Credit Outstanding, Amount $ 25,000