Note 7—Intangible Assets

Intangible assets consist primarily of licenses, product lines, customer relationships and trademarks. Amortized intangible assets are included in intangibles in the accompanying balance sheets. Trademarks are disclosed separately in the accompanying balance sheets. Intangible assets are as follows (in thousands, except for weighted useful lives):

		December 31, 2016							December 31, 2017
	Weighted Useful Lives	Gross Carrying Amount		Accumulated Amortization			Net Amount		Gross Carrying Amount		Accumulated Amortization			Net Amount
	(Years)

Amortized Intangible Assets:
Licenses	5.81	$	20,130	$	(17,248	)	$	2,882	$	20,130	$	(18,620	)	$	1,510
Product lines	5.07		50,093		(20,634	)		29,459		33,858		(13,178	)		20,680
Customer relationships	4.90		3,152		(2,755	)		397		3,152		(3,152	)		―
Trade names	5.00		3,000		(2,650	)		350		3,000		(3,000	)		―
Non-compete/ Employment contracts	5.00		200		(177	)		23		200		(200	)		―
Total amortized intangible assets		$	76,575	$	(43,464	)	$	33,111	$	60,340	$	(38,150	)	$	22,190
Unamortized Intangible Assets:
Trademarks		$	2,608	$	―		$	2,608	$	300	$	―		$	300

In 2017, the Company recorded impairment charges of $2.9 million to write off the remaining unamortized technology rights related to DreamPlay, LLC which were included in product lines, and $2.3 million to write down several underutilized trademarks and trade names that were determined to have no value.

For the years ended December 31, 2015, 2016 and 2017, the Company’s aggregate amortization expense related to intangible assets was $8.0 million, $8.8 million and $8.0 million, respectively. The Company currently estimates continuing future amortization expense to be approximately (in thousands):

2018	$	4,261
2019		3,327
2020		3,053
2021		3,053
2022		3,053
Thereafter		5,443
	$	22,190