Goodwill and Identified Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

The following table presents goodwill by reportable segments (in thousands):



	Video		Cable Edge			Total
As of December 31, 2015	$	136,904	$	60,877		$	197,781
Preliminary estimate of goodwill from TVN acquisition	41,670		—			41,670
Foreign currency translation adjustment	515		(86		)	429
As of September 30, 2016	$	179,089	$	60,791		$	239,880

Summary of Goodwill and Identified Intangible Assets

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



		September 30, 2016							December 31, 2015
	Weighted Average Remaining Life (Years)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Developed core technology	3.4	$	33,057	$	(14,112	)	$	18,945	$	10,987	$	(10,987	)	$	—
Customer relationships/contracts	4.4	44,659		(31,004		)	13,655		29,200		(25,752		)	3,448
Trademarks and trade names	3.4	610		(89		)	521		—		—			—
Maintenance agreements and related relationships	N/A	5,500		(5,500		)	—		5,500		(4,851		)	649
Order Backlog	N/A	3,661		(3,661		)	—		—		—			—
Total identifiable intangibles		$	87,487	$	(54,366	)	$	33,121	$	45,687	$	(41,590	)	$	4,097

Amortization Expense for Identifiable Purchased Intangible Assets

Amortization expense for the identifiable purchased intangible assets for the three and nine months ended September 30, 2016 and October 2, 2015 was allocated as follows (in thousands):



	Three months ended				Nine months ended
	September 30, 2016		October 2, 2015		September 30, 2016		October 2, 2015
Included in cost of revenue	$	1,380	$	86	$	3,105	$	633
Included in operating expenses	3,009		1,446		9,606		4,338
Total amortization expense	$	4,389	$	1,532	$	12,711	$	4,971

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,
2016 (remaining three months)	$	1,380	$	811	$	2,191
2017	5,517		3,244		8,761
2018	5,517		3,244		8,761
2019	5,517		3,244		8,761
2020	1,014		3,117		4,131
Thereafter	—		516		516
Total future amortization expense	$	18,945	$	14,176	$	33,121