Segment Information (Long-Lived Assets by Geographic Region) (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 22,389	$ 24,016
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	15,012	16,821
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	4,544	4,898
Republic of Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	268	282
Rest of the World
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 2,565	$ 2,015