Intangible Assets

6 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible Assets

Intangible assets are summarized as follows (in thousands):

	June 30, 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	$	(1,133	)	$	281	$	1,414	$	(1,066	)	$	348
Patents and know how	8,967		(4,746		)	4,221		9,180		(4,475		)	4,705
Customer and supplier relationships	3,761		(2,283		)	1,478		4,271		(2,202		)	2,069
Non-compete agreements	120		(53		)	67		120		(38		)	82
Total amortized intangible assets	$	14,262	$	(8,215	)	$	6,047	$	14,985	$	(7,781	)	$	7,204
Unamortized intangible assets
Trade names and trademarks	$	1,008				$	1,008	$	1,008				$	1,008
Patents in process	1,049					1,049		1,396					1,396
Total intangible assets	$	16,319				$	8,104	$	17,389				$	9,608

Amortization expense for the six months ended June 30, 2019 and 2018, was approximately $0.5 million and $0.5 million, respectively, and $0.3 million and $0.2 million for the three months ended June 30, 2019 and 2018, respectively. Patents and patents in process related write-downs due to abandonment for the three and six months ended June 30, 2019 was $0.0 million and $0.8 million, respectively. These write-down 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 $0.0 million and $0.5 million for the three and six months ended June 30, 2019, respectively.

Expected future amortization of intangible assets as of June 30, 2019, is as follows (in thousands):

Year ending December 31,	Estimated Amortization Expense
2019 (excluding the six months ended June 30, 2019)	$	492
2020	985
2021	977
2022	955
2023	954
Thereafter	1,684
	$	6,047