Intangible Assets - Additional Information (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Impairment charge		$ 0
Subsequent impairment of the underlying assets	$ 0
Expected amortization expense for the remainder of 2016	200,000
Expected amortization expense for 2017	900,000
Expected amortization expense for 2018	900,000
Expected amortization expense for 2019	900,000
Expected amortization expense for 2020	$ 200,000