Organization and Basis of Presentation - Additional Information (Detail) - USD ($)			2 Months Ended	3 Months Ended
	Mar. 03, 2017	Feb. 22, 2017	Mar. 31, 2017	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Organization And Basis Of Presentation [Line Items]
Month and year of incorporation				2007-01
Cash and cash equivalents			$ 14,654,998	$ 14,654,998	$ 9,007,071	$ 6,099,698	$ 8,691,155
Underwritten Public Offering [Member]
Organization And Basis Of Presentation [Line Items]
Issuance of common stock from public offering of common stock	362,068	2,413,793	2,775,861
Gross proceeds from public offering of common stock	$ 8,000,000		$ 8,000,000