Inventory - Summary of Inventory (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Inventory [Line Items]
Total inventory	$ 501,406	$ 154,626
Prepaid Expendables [Member]
Inventory [Line Items]
Total inventory	53,781	32,419
Project Materials [Member]
Inventory [Line Items]
Total inventory	$ 447,625	$ 122,207