Intangible assets, in-process research and development and goodwill (Tables)

3 Months Ended

Mar. 31, 2016

Intangible assets and in-process research and development [Abstract]

Intangible assets consisted of the following:

	Biodefense			Aptevo
(in thousands)	Segment			Segment			Total
Cost basis
Balance at December 31, 2015	$	55,790		$	20,809		$	76,599
Additions		-			-			-
Balance at March 31, 2016	$	55,790		$	20,809		$	76,599

Accumulated amortization
Balance at December 31, 2015	$	(15,857	)	$	(3,368	)	$	(19,225	)
Amortization		(1,779	)		(585	)		(2,364	)
Balance at March 31, 2016	$	(17,636	)	$	(3,953	)	$	(21,589	)

Net balance at March 31, 2016	$	38,154		$	16,856		$	55,010

Finite-lived Intangible Assets Amortization Expense

Amortization expense consisted of the following:

	Three Months Ended March 31,
(in thousands)	2016		2015

Biodefense segment	$	1,779	$	1,763
Aptevo segment		585		379
Total amortization expense	$	2,364	$	2,142

As of March 31, 2016, the weighted average amortization period remaining for intangible assets in the Biodefense and Aptevo segments was 83 and 94 months, respectively.