Segment Reporting - Geographic Information of Revenue by Region (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 8,299	$ 13,756
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,082	511
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,132	2,383
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,732	9,011
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,351	1,844
Rest of The World [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 2	$ 7