Intangible Assets

The Company’s intangible assets at September 30, 2017 and December 31, 2016 consisted of the following:



	September 30, 2017							December 31, 2016
(in thousands)	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Impairment			Net
Other intangible assets:
Developed technology	$	757,000	$	(85,071	)	$	671,929	$	757,000	$	(55,623	)	$	—		$	701,377
In-process research and development	39,000		(2,347		)	36,653		39,000		(722		)	—			38,278
Trade name	26,000		—			26,000		35,500		—			(9,500		)	26,000
Service provider network	2,000		—			2,000		2,000		—			—			2,000
Customer relationships	8,000		(722		)	7,278		8,000		(472		)	—			7,528
Software	1,200		(320		)	880		660		(104		)	—			556
Software not yet placed in service	3,974		—			3,974		753		—			—			753
Other	100		(21		)	79		100		(8		)	—			92
Total intangible assets	$	837,274	$	(88,481	)	$	748,793	$	843,013	$	(56,929	)	$	(9,500	)	$	776,584

At September 30, 2017, the weighted-average amortization period remaining for the finite-lived intangible assets was 17.6 years. At September 30, 2017, the weighted-average amortization periods remaining for developed technology, customer relationships, in-process R&D, software and other was 17.6, 21.9, 17.0, 3.3, and 4.8 years, respectively.

Estimated annual amortization expense for finite-lived intangible assets, excluding amounts not placed in service, subsequent to September 30, 2017 is as follows:



(in thousands)	Amount
2017 (remaining)	$	10,518
2018	42,071
2019	42,052
2020	41,919
2021	41,814
Thereafter	538,445
Total	$	716,819