Goodwill (Tables)

3 Months Ended

Mar. 31, 2014

Goodwill And Intangible Assets Disclosure [Abstract]

Rollforward of Goodwill Activity by Reportable Segment

A rollforward of goodwill activity by reportable segment is as follows:

	Detection		Therapy		Total
Accumulated Goodwill	$	—	$	—	$	47,937
Accumulated impairment		—		—		(26,828	)
Fair value allocation		7,663		13,446		—
Balance at December 31, 2013		7,663		13,446		21,109
		—		—		—
Balance at March 31, 2014	$	7,663	$	13,446	$	21,109