Intangible Assets

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible Assets

The components of intangible assets, net are as follows (in thousands):

	December 31, 2017					December 31, 2016					Estimated
	Cost		Accumulated Amortization			Cost		Accumulated Amortization			Useful Life
Bloodline, needle and other patented and unpatented technology	$	6,200	$	(6,200	)	$	6,200	$	(6,200	)	8 years
Trade names	2,300		(1,684		)	2,300		(1,520		)	14 years
Customer relationships	26,151		(19,107		)	26,138		(17,230		)	10/14 years
Intangible assets, net	$	34,651	$	(26,991	)	$	34,638	$	(24,950	)

We recognized amortization expense of $2.0 million, $2.0 million and $2.6 million during 2017, 2016 and 2015, respectively.

The estimated future aggregated amortization expense for intangible assets as of December 31, 2017 is as follows (in thousands):

2018	$	2,036
2019	2,036
2020	2,036
2021	1,552
	$	7,660