Purchased Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible assets, net are as follows (in thousands):


		December 31, 2017
	Estimated Useful Life (in Years)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Developed technology	10	$	4,282	$	2,249	$	2,033
Customer relationships	12		9,011		3,942		5,069
Customer backlog	1		2,779		2,779		—
Non-compete agreement	5		282		282		—
TowerJazz license	2		350		—		350
Total intangible assets subject to amortization		$	16,704	$	9,252	$	7,452


		December 31, 2016
	Estimated Useful Life (in Years)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Developed technology	10	$	4,282	$	1,820	$	2,462
Customer relationships	12		9,011		3,191		5,820
Customer backlog	1		2,779		2,779		—
Non-compete agreement	5		282		240		42
Total intangible assets subject to amortization		$	16,354	$	8,030	$	8,324

Schedule of Amortization Expense of Intangible Assets


		December 31, 2016
	Estimated Useful Life (in Years)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Developed technology	10	$	4,282	$	1,820	$	2,462
Customer relationships	12		9,011		3,191		5,820
Customer backlog	1		2,779		2,779		—
Non-compete agreement	5		282		240		42
Total intangible assets subject to amortization		$	16,354	$	8,030	$	8,324

We recorded amortization expense related to the acquisition-related intangible assets as follows (in thousands):


	Year Ended December 31,
	2017		2016		2015
Operating expense category:
Research and development	$	471	$	484	$	484
Sales and marketing		751		751		752
Total	$	1,222	$	1,235	$	1,236

Schedule of Finite-Lived Intangible Assets, Annual Expected Amortization Expense

The estimated future amortization expense of acquisition-related intangible assets subject to amortization as of December 31, 2017 is as follows (in thousands):


Year Ended December 31,
2018	$	1,354
2019		1,354
2020		1,179
2021		1,179
2022		1,072
Thereafter		1,314
Total	$	7,452