Intangible Assets - Additional Information (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Impairment charge		$ 0
Subsequent impairment of the underlying assets	$ 0
Expected amortization expense for the remainder of 2015	400,000
Expected amortization expense for 2016	800,000
Expected amortization expense for 2017	800,000
Expected amortization expense for 2018	800,000
Expected amortization expense for 2019	800,000
Expected amortization expense for 2020	$ 800,000