Commitments & Contingencies - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Commitments and Contingencies Disclosure [Line Items]
Operating Leases, Rent Expense	$ 106,000	$ 52,000
Operating Leases, Future Minimum Payments Due, Next Twelve Months	83,000
Operating Leases, Future Minimum Payments, Due in Two Years	154,000
Operating Leases, Future Minimum Payments, Due in Three Years	147,000
Operating Leases, Future Minimum Payments, Due in Four Years	145,000
Operating Leases, Future Minimum Payments, Due in Five Years	90,000
Operating Leases, Future Minimum Payments, Due Thereafter	77,000
Texas Railroad Commission [Member]
Commitments and Contingencies Disclosure [Line Items]
Letters of Credit Outstanding, Amount	$ 50,000