Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Aggregate amortization expense	$ 47	$ 192
Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful lives (in years)	2 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful lives (in years)	10 years