Acquisition - Additional Information (Detail) $ in Thousands			12 Months Ended
	Aug. 01, 2018 USD ($)	Dec. 17, 2012 USD ($) Installment	Dec. 31, 2016 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Jan. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Cash paid for acquisition				$ 1,200	$ 1,200
Payment of earnout liabilities			$ 459
Measurement Input, Discount Rate [Member]
Business Acquisition [Line Items]
Discount rate of projected net cash flows		10
Significant Unobservable Inputs (Level 3) [Member] | Measurement Input, Discount Rate [Member]
Business Acquisition [Line Items]
Discount rate of projected net cash flows		28
LeMagIT [Member]
Business Acquisition [Line Items]
Cash paid for acquisition		$ 2,200
Potential future earn-out		$ 700
Number of installments for acquisition cost | Installment		2
Contingent consideration							$ 1,300
Contingent consideration, holdback amount						$ 400
Payment of earnout liabilities			$ 500
Oceanos Marketing, Inc [Member]
Business Acquisition [Line Items]
Consideration paid on acquisition	$ 600