Segment Information - Long-Lived Assets by Location (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 27,456	$ 20,155
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	17,740	9,913
Israel [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	9,692	10,224
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 24	$ 18