Segment Information (Long-Lived Assets by Geographic Region) (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 39,585	$ 43,712
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	30,198	33,421
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	6,172	6,696
Republic of Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	438	547
Rest of the World
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 2,777	$ 3,048