Goodwill and Other Intangible Assets

The Company's goodwill was $7.0 million as of March 31, 2017 and December 31, 2016. All goodwill resides in the PCT reporting unit.

The Company's intangible assets and related accumulated amortization as of March 31, 2017 and December 31, 2016 consisted of the following (in thousands):



		March 31, 2017							December 31, 2016
	Useful Life	Gross		Accumulated Amortization			Net		Gross		Accumulated Amortization			Net
Customer list	10 years	$	1,000.0	$	(620.1	)	$	379.9	$	1,000.0	$	(595.1	)	$	404.9
Manufacturing technology	10 years	3,900.0		(2,418.4		)	1,481.6		3,900.0		(2,320.9		)	1,579.1
Tradename	10 years	800.0		(496.1		)	303.9		800.0		(476.1		)	323.9
Total intangible assets		$	5,700.0	$	(3,534.6	)	$	2,165.4	$	5,700.0	$	(3,392.1	)	$	2,307.9

Total intangible amortization expense was classified in the operating expense categories for the periods included below as follows (in thousands):



	Three Months Ended March 31,
	2017		2016
Cost of revenue	$	78.6	$	79.6
Research and development	18.9		17.9
Selling, general and administrative	45.0		45.0
Total	$	142.5	$	142.5

Estimated intangible amortization expense for the succeeding five years is as follows (in thousands):



2017	$	427.5
2018	570.0
2019	570.0
2020	570.0
Thereafter	27.9
Total	$	2,165.4