Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Goodwill

The following tables summarize the Company’s total purchased intangible assets (in thousands):

	Gross		Accumulated Amortization			Net
December 31, 2017
Purchased technology	$	114,754	$	(110,674	)	$	4,080
Patents	6,472		(6,472		)	—
Customer lists	37,000		(37,000		)	—
Trade names	11,536		(8,754		)	2,782
Total intangible assets	$	169,762	$	(162,900	)	$	6,862
December 31, 2016
Purchased technology	$	114,754	$	(102,967	)	$	11,787
Patents	6,472		(6,472		)	—
Customer lists	37,000		(34,784		)	2,216
Trade names	11,536		(7,964		)	3,572
Backlog	$	2,127	$	(2,127	)	—
Total intangible assets	$	171,889	$	(154,314	)	$	17,575

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

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

For the Years Ending December 31,	Estimated Intangible Amortization Amount
2018	$	4,870
2019	790
2020	790
2021	412
Thereafter	—
Total estimated future amortization expense	$	6,862