Intangible Assets

3 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets and Royalty Agreement

Intangible Assets

Intangible assets are summarized as follows (in thousands):

	March 31, 2019							December 31, 2018
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Amortized intangible assets
Licenses	$	1,414	$	(1,099	)	$	315	$	1,414	$	(1,066	)	$	348
Patents and know how	8,966		(4,589		)	4,377		9,180		(4,475		)	4,705
Customer and supplier relationships	3,761		(2,216		)	1,545		4,271		(2,202		)	2,069
Non-compete agreements	120		(45		)	75		120		(38		)	82
Total amortized intangible assets	$	14,261	$	(7,949	)	$	6,312	$	14,985	$	(7,781	)	$	7,204
Unamortized intangible assets
Trade names and trademarks	$	1,008				$	1,008	$	1,008				$	1,008
Patents in process	972					972		1,396					1,396
Total intangible assets	$	16,241				$	8,292	$	17,389				$	9,608

Amortization expense for the three months ended March 31, 2019 and 2018, was approximately $0.2 million and $0.3 million, respectively. Patents and patents in process related write-downs due to abandonment were $0.8 million and $0.0 million during the three months ended March 31, 2019 and 2018, respectively. These write-downs were recorded as a component of Selling, general and administrative expense. The Company incurred impairment losses related to customer relationships which were determined to be unrecoverable of and $0.4 million and $0.0 million for the three months ended March 31, 2019 and 2018, respectively.

Expected future amortization of intangible assets as of March 31, 2019, is as follows (in thousands):

	Estimated
	Amortization
Year ending December 31,	Expense
2019 (excluding the three months ended March 31, 2019)	$	736
2020	985
2021	977
2022	955
2023	955
Thereafter	1,704
	$	6,312