Purchased Intangible Assets, Net

12 Months Ended

Dec. 31, 2016

Purchased Intangible Assets, Net

6. Purchased Intangible Assets, Net

Information regarding acquisition-related intangible assets is as follows:

	December 31, 2016						January 2, 2016
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
	(in thousands)
Customer relationships	$	3,119	$	2,869	$	250	$	3,119	$	2,646	$	473
Purchased technology		5,148		3,140		2,008		5,148		2,509		2,639
Covenants not to compete		40		40		—		40		40		—
Backlog		80		80		—		80		80		—
Total amortizable intangible assets	$	8,387	$	6,129	$	2,258	$	8,387	$	5,275	$	3,112

Intangible assets by segment as of December 31, 2016 are as follows: Thin-film Equipment; $2.0 million and Photonics; $217,000.

Total amortization expense of purchased intangibles for fiscal 2016, 2015 and 2014 was $854,000, $854,000, and $936,000 respectively.

Estimated future amortization expense related to finite-lived purchased intangible assets as of December 31, 2016, is as follows.

(in thousands)
2017		755
2018		615
2019		615
2020		273
	$	2,258