Operating Leases - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
General and Administrative Expense
Operating Leased Assets [Line Items]
Total rent expense under leases	$ 23,463	$ 24,459	$ 55,474	$ 59,952