Operating Leases - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
General and administrative expense
Operating Leased Assets [Line Items]
Total rent expense under leases	$ 12,642	$ 17,766	$ 32,011	$ 35,493