Organization and Business - Additional Information (Detail) - USD ($)		6 Months Ended	12 Months Ended
	Jan. 15, 2014	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013	Nov. 05, 2013
Organization and Nature of Operations [Line Items]
Cash		$ 11,079,999	$ 13,858,798	$ 15,721,128	$ 3,551,832
Authorized capital to be raised						$ 100,000,000
Stock issued during period, shares, new issues	5,000,000
Stock issued during period, value, new issues	$ 15,000,000
Proceeds from issuance initial public offering	$ 13,800,000
Common Stock
Organization and Nature of Operations [Line Items]
Proceeds from Stock Options Exercised			$ 435,500
Exercise of stock options (in shares)			525,000
Warrant
Organization and Nature of Operations [Line Items]
Stock issued during period, shares, new issues	2,500,000
Stock issued during period, value, new issues		$ 25,000,000