Goodwill and Identified Intangible Assets (Tables)

9 Months Ended

Sep. 28, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in the carrying amount of goodwill by reportable segments for the nine months ended September 28, 2018 were as follows (in thousands):



	Video			Cable Access			Total
Balance as of December 31, 2017	$	182,012		$	60,815		$	242,827
Foreign currency translation adjustment	(1,297		)	(18		)	(1,315		)
Balance as of September 28, 2018	$	180,715		$	60,797		$	241,512

Summary of Goodwill and Identified Intangible Assets

The following is a summary of intangible assets, net (in thousands):



		September 28, 2018							December 31, 2017
	Weighted Average Remaining Life (Years)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Developed core technology	1.4	$	31,707	$	(24,281	)	$	7,426	$	31,707	$	(20,396	)	$	11,311
Customer relationships/contracts	2.4	44,718		(37,431		)	7,287		44,819		(35,205		)	9,614
Trademarks and trade names	1.4	635		(410		)	225		654		(300		)	354
Maintenance agreements and related relationships	n/a	5,500		(5,500		)	—		5,500		(5,500		)	—
Order Backlog	n/a	3,138		(3,138		)	—		3,177		(3,177		)	—
Total identifiable intangibles		$	85,698	$	(70,760	)	$	14,938	$	85,857	$	(64,578	)	$	21,279

Amortization Expense for Identifiable Purchased Intangible Assets

Amortization expense for the identifiable purchased intangible assets for the three and nine months ended September 28, 2018 and September 29, 2017 was allocated as follows (in thousands):



	Three months ended				Nine months ended
	September 28, 2018		September 29, 2017		September 28, 2018		September 29, 2017
Included in cost of revenue	$	1,295	$	1,295	$	3,885	$	3,885
Included in operating expenses	792		793		2,396		2,347
Total amortization expense	$	2,087	$	2,088	$	6,281	$	6,232

Estimated Future Amortization Expense of Purchased Intangible Assets

The estimated future amortization expense of purchased intangible assets with definite lives is as follows (in thousands):



	Cost of Revenue		Operating Expenses		Total
Year ended December 31,
2018 (remaining three months)	$	1,295	$	794	$	2,089
2019	5,180		3,174		8,354
2020	951		3,042		3,993
2021	—		502		502
Total future amortization expense	$	7,426	$	7,512	$	14,938