Summary of Timing of Revenue Recognition, Includes Reconciliation of Disaggregated Revenue by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Total Revenue	$ 31,824	$ 32,915
Portal & Advertising [Member]
Disaggregation Of Revenue [Line Items]
Total Revenue	20,666	22,230
Portal & Advertising [Member] | Products Transferred At Point In Time [Member]
Disaggregation Of Revenue [Line Items]
Total Revenue	19,160	20,143
Portal & Advertising [Member] | Products and Services Transferred Over Time [Member]
Disaggregation Of Revenue [Line Items]
Total Revenue	1,506	2,087
Software & Services [Member]
Disaggregation Of Revenue [Line Items]
Total Revenue	11,158	10,685
Software & Services [Member] | Products Transferred At Point In Time [Member]
Disaggregation Of Revenue [Line Items]
Total Revenue	2,283	1,899
Software & Services [Member] | Products and Services Transferred Over Time [Member]
Disaggregation Of Revenue [Line Items]
Total Revenue	$ 8,875	$ 8,786