Goodwill and Identified Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

(in thousands):



	Video			Cable Edge			Total
Balance as of December 31, 2015	$	136,904		$	60,877		$	197,781
Goodwill from TVN acquisition⁽¹⁾	41,670			—			41,670
Foreign currency translation adjustment	(2,055		)	(117		)	(2,172		)
Balance as of December 31, 2016	$	176,519		$	60,760		$	237,279
Foreign currency translation adjustment	5,493			55			5,548
Balance as of December 31, 2017	$	182,012		$	60,815		$	242,827

The table below is a summary of the Company’s identified intangible assets (in thousands):



		December 31, 2017							December 31, 2016
	Weighted Average Remaining Life (Years)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Developed core technology	2.2	$	31,707	$	(20,396	)	$	11,311	$	31,707	$	(15,216	)	$	16,491
Customer relationships/contracts	3.2	44,819		(35,205		)	9,614		44,384		(32,098		)	12,286
Trademarks and tradenames	2.2	654		(300		)	354		573		(119		)	454
Maintenance agreements and related relationships	N/A	5,500		(5,500		)	—		5,500		(5,500		)	—
Order Backlog	N/A	3,177		(3,177		)	—		3,011		(3,011		)	—
Total identifiable intangibles		$	85,857	$	(64,578	)	$	21,279	$	85,175	$	(55,944	)	$	29,231

Amortization expense for the identifiable intangible assets was allocated as follows (in thousands):



	Year Ended December 31,
	2017		2016		2015
Included in cost of revenue	$	5,180	$	4,434	$	719
Included in operating expenses	3,142		10,402		5,783
Total amortization expense	$	8,322	$	14,836	$	6,502

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



	Cost of Revenue		Operating Expenses		Total
Year ended December 31,
2018	$	5,180	$	3,199	$	8,379
2019	5,180		3,199		8,379
2020	951		3,063		4,014
2021	—		507		507
Total future amortization expense	$	11,311	$	9,968	$	21,279