Segment Information - Long-Lived Assets by Location (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 16,407	$ 5,475
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	6,433	3,039
Israel [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	9,952	2,422
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 22	$ 14