Intangibles - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2015
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	1 year
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	7 years
Capitalized patent costs [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	17 years