Segment Information - Long-Lived Assets by Location (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 20,155	$ 17,017	$ 5,475
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	9,913	6,761	3,039
Israel [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	10,224	10,221	2,422
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 18	$ 35	$ 14