Related Party Transactions - Additional Information (Detail) - USD ($)		1 Months Ended		6 Months Ended		12 Months Ended
	Jan. 24, 2014	Jan. 31, 2014	Nov. 30, 2013	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Compensation Plans [Line Items]
Payment made to the company by the beneficial owner				$ 327,016	$ 223,746
Number of options exercised				218,010		1,138,331
Clarence E. Smith [Member]
Compensation Plans [Line Items]
Beneficial ownership percentage		5.00%	5.00%
Notes payable to related party							$ 205,314
Payment made to the company by the beneficial owner			$ 200,000
Exercised price		$ 1.50	$ 1.50
Number of options exercised	138,331	138,331
Payment to related party				$ 70,000	32,000
Opportune LLP [Member]
Compensation Plans [Line Items]
Payment to related party				$ 98,295	$ 0