Note 3 - Goodwill and Acquired Intangible Assets

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Intangible Assets Disclosure [Text Block]

3.

Goodwill and Acquired Intangible Assets

Intangible assets and goodwill were initially measured at the acquisition date at estimated fair value and capitalized for the acquisitions of our wholly-owned subsidiaries EXINI and MIP.

The following table summarizes the activity related to goodwill and intangible assets:

						Other
						Intangible
	Goodwill		IPR&D			Assets
Balance at January 1, 2017	$	13,074	$	28,700		$	1,881
Amortization expense		-		-			(212	)
Balance at December 31, 2017		13,074		28,700			1,669
Reclassification		-		(4,900	)		4,900
Amortization expense		-		-			(503	)
Impairment		-		(23,200	)		-
Balance at December 31, 2018	$	13,074	$	600		$	6,066

The following table reflects the components of the finite-lived intangible assets as of

December 31, 2018:

	Gross Amount		Accumulated Amortization		Net Carrying Value
Intangible assets - AZEDRA product rights	$	4,900	$	291	$	4,609
Intangible assets - EXINI technology		2,120		663		1,457
Total	$	7,020	$	954	$	6,066

The weighted-average remaining life of the finite-lived intangible assets was approximately

seven

years at

December 31, 2018.

Amortization expense was calculated on a straight-line basis over the estimated useful life of the asset and was

$503

thousand,

$212

thousand and

$212

thousand per year for the years ended

December 31, 2018,

2017

and

2016,

respectively. Assuming

no

changes in the gross carrying amount of finite lived intangible assets, the future annual amortization expense related to finite lived intangible assets is expected to be

$912

thousand in each of the next

five

years (

2019

through

2023

).