Goodwill and Intangible Assets - Schedule of Identifiable Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 12,790	$ 12,790
Accumulated Amortization	(4,330)	(3,844)
Intangible assets, net	$ 8,460	8,946
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Weighted- Average Life	6 years 3 months 18 days
Gross Carrying Amount	$ 11,231	11,231
Accumulated Amortization	(3,557)	(3,118)
Intangible assets, net	$ 7,674	8,113
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Weighted- Average Life	6 years 8 months 12 days
Gross Carrying Amount	$ 1,000	1,000
Accumulated Amortization	(236)	(197)
Intangible assets, net	$ 764	803
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Weighted- Average Life	6 years 1 month 6 days
Gross Carrying Amount	$ 519	519
Accumulated Amortization	(499)	(496)
Intangible assets, net	$ 20	23
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Weighted- Average Life	2 years
Gross Carrying Amount	$ 40	40
Accumulated Amortization	(38)	(33)
Intangible assets, net	$ 2	$ 7