Goodwill and Intangible Assets

The Company’s amortizable and unamortizable intangible assets at September 30, 2018 and December 31, 2017 are as follows:



	September 30, 2018							December 31, 2017
Goodwill and Intangible Assets:	Gross Value		Accumulated Amortization			Net Carrying Amount		Gross Value		Accumulated Amortization			Net Carrying Amount

Amortizable intangible assets:
Acquired developed technology - Noctiva	$	73,111	$	(5,606	)	$	67,505	$	73,111	$	(1,401	)	$	71,710
Acquired developed technology - Vazculep	12,061		(10,227		)	1,834		12,061		(9,616		)	2,445
Acquired product marketing rights ⁽¹⁾	—		—			—		16,600		(2,132		)	14,468
Acquired developed technology ⁽¹⁾	—		—			—		4,300		(634		)	3,666
Total amortizable intangible assets	$	85,172	$	(15,833	)	$	69,339	$	106,072	$	(13,783	)	$	92,289

Unamortizable intangible assets:
Goodwill	$	18,491	$	—		$	18,491	$	18,491	$	—		$	18,491
Total unamortizable intangible assets	$	18,491	$	—		$	18,491	$	18,491	$	—		$	18,491

⁽¹⁾ These intangible assets were assumed by the buyer as part of the disposition of the pediatrics products on February 16, 2018. See Note 12: Divestiture of the Pediatric Assets.

The Company recorded amortization expense related to amortizable intangible assets of $1,620 and $564 for the three months ended September 30, 2018 and 2017, respectively and $4,996 and $1,692 for the nine months ended September 30, 2018 and 2017, respectively.

Amortizable intangible assets are amortized over their estimated useful lives, which range from three to fifteen years. Estimated amortization of intangible assets for the next five years is as follows:



Estimated Amortization Expense:	Amount

2018	$	6,619
2019	6,439
2020	6,439
2021	5,624
2022	5,624