Segment Reporting - Revenue by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue by geographic area
Total revenue	$ 31,146	$ 60,909	$ 33,862	$ 23,004	$ 21,146	$ 18,412	$ 23,684	$ 17,949	$ 148,921	$ 81,191	$ 71,480
Reportable Geographical Components [Member] | United States [Member]
Revenue by geographic area
Total revenue									42,535	34,591	37,896
Reportable Geographical Components [Member] | European [Member]
Revenue by geographic area
Total revenue									$ 106,386	$ 46,600	$ 33,584