Information Related to Common Stock Award Expense (Detail) - Common Stock Award - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock-based compensation expense	$ 50,624	$ 76,647
Unrecognized expense	0
Consulting
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock-based compensation expense	50,624	67,800
Unrecognized expense	0
Research and development
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock-based compensation expense	0	$ 8,847
Unrecognized expense	$ 0