Segment Information - Long-Lived Assets by Location (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 17,161	$ 5,475
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	6,437	3,039
Israel [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	10,694	2,422
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 30	$ 14