Segment and Geographic Information (Tables)

6 Months Ended

Jun. 30, 2013

Segment and Geographic Information

Summary of the revenue generated through sales personnel employed by the Company's U.S. and non-U.S. subsidiaries

	Three Months Ended June 30,				Six Months Ended June 30.
	2012		2013		2012		2013
	(unaudited)				(unaudited)
Revenue
Domestic	$	24,067	$	34,785	$	40,256	$	58,704
International	1,139		680		2,222		1,526
Total	$	25,206	$	35,465	$	42,478	$	60,230