Information about Geographic Areas (Tables)

9 Months Ended

Sep. 30, 2012

Information about Geographic Areas [Abstract]

Revenues by geographic area, based on billing location of customer

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
North America	$	45,509	$	24,513	$	120,124	$	65,929
Europe		16,133		8,574		42,027		21,856
Asia Pacific and other		2,703		1,110		6,399		1,109
Total revenues	$	64,345	$	34,197	$	168,550	$	88,894

Long-lived assets by geographic area

	September 30, 2012		December 31, 2011
North America	$	28,561	$	15,820
Europe		9,320		4,537
Asia Pacific and other		1,205		338
Total long-lived assets	$	39,086	$	20,695