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Intangibles Assets, Net
 12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, Net
INTANGIBLE ASSETS, NET

As of December 31, 2016, the gross carrying amount of all our intangible assets was $18.1 million and accumulated amortization was $7.5 million. The weighted average remaining life of all our intangible assets was 8.9 years as of December 31, 2016. Amortization expense for our intangibles was $1.7 million for each of the years ended December 31, 2016, 2015 and 2014.

The following table summarizes the balances and activity of our intangibles:
(In thousands)
 
 
At December 31, 2016
 
At December 31, 2015
Category
Weighted Average Years
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Book Value
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Book Value
 
Developed technology
6
 
$
1,080

 
$
(432
)
 
$
648

 
$
1,080

 
$
(324
)
 
$
756

 
Patents
9
 
15,946

 
(6,384
)
 
9,562

 
15,946

 
(5,000
)
 
10,946

 
Trade names
6
 
209

 
(82
)
 
127

 
209

 
(62
)
 
147

 
Customer relationships
2
 
878

 
(585
)
 
293

 
878

 
(439
)
 
439

 
Total
 
 
$
18,113

 
$
(7,483
)
 
$
10,630

 
$
18,113

 
$
(5,825
)
 
$
12,288

 


Intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. Based on the intangible assets recorded as of December 31, 2016, and assuming no subsequent additions to or impairment of the underlying assets, the remaining estimated annual amortization expense is expected to be as follows:
Year
(In thousands)
2017
1,602

2018
1,479

2019
1,222

2020
1,110

2021
1,049

Thereafter
4,168

Total
$
10,630