Segment Information (Tables)

3 Months Ended

Mar. 31, 2015

Segment Information

Summary of total revenues from customers, payors and collaboration partners by geographic region

	Three Months Ended
	March 31,
	2015		2014
United States	$	57,717	$	55,468
Outside of the United States		10,435		11,534
Total revenues	$	68,152	$	67,002