Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets, Net and Goodwill

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Intangible Assets, Net and Goodwill
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, Net and Goodwill
INTANGIBLE ASSETS, NET
Intangible assets that are determined to have finite lives include patents, purchased technology and customer relationships and are amortized over their estimated useful lives, which range from approximately 3 to 10 years, and are measured for impairment only when events or circumstances indicate the carrying value may be impaired. Goodwill and intangible assets with indefinite useful lives, including trademarks and trade names, are not amortized but are evaluated for impairment on an annual basis during the fourth quarter of our fiscal year or earlier if events or circumstances indicate the carrying value may be impaired.
Intangible Assets
The following table summarizes the Company's identifiable intangible assets (in thousands):
 
September 30,
2018
 
December 31,
2017
 
September 30,
2017
Intangible assets subject to amortization:
 
 
 
 
 
Patents and purchased technology
$
14,198

 
$
14,198

 
$
14,198

Customer relationships
23,000

 
23,000

 
23,000

Gross carrying amount
37,198

 
37,198

 
37,198

Accumulated amortization:
 
 
 
 
 
Patents and purchased technology
(11,649
)
 
(10,651
)
 
(10,319
)
Customer relationships
(13,650
)
 
(12,413
)
 
(12,000
)
Total accumulated amortization
(25,299
)
 
(23,064
)
 
(22,319
)
Net carrying amount
11,899

 
14,134

 
14,879

Intangible assets not subject to amortization
115,421

 
115,421

 
115,421

Intangible assets, net
$
127,320

 
$
129,555

 
$
130,300


Amortization expense for intangible assets subject to amortization was approximately $745,000 for the three months ended September 30, 2018 and 2017, respectively, and was approximately $2,235,000 and $3,138,000 for the nine months ended September 30, 2018 and 2017, respectively.
Annual amortization expense is estimated to be as follows for the years 2018 through 2022 (in thousands):
2018
$
2,980

2019
2,980

2020
2,537

2021
1,650

2022
1,650