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Intangibles Assets, Net
 12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, Net
INTANGIBLE ASSETS, NET

During the year ended December 31, 2013, we entered into one patent assignment agreement and acquired the rights to collections of patents and patent applications.

On December 14, 2012, we acquired from Cambridge NanoTech, intangible assets of $4.3 million and other tangible assets of an insignificant amount in a cash transaction. We accounted for this transaction using the acquisition method.

As of December 31, 2015, the gross carrying amount of all our intangible assets was $18.1 million and accumulated amortization was $5.8 million. The weighted average remaining life of all our intangible assets was 9.6 years as of December 31, 2015. During the years ended December 31, 2015, 2014 and 2013, our amortization expense for our intangibles was $1.7 million, $1.7 million and $1.5 million, respectively.

The following table summarizes the balances and activity of our intangibles:
(In thousands)
 
 
At December 31, 2015
 
At December 31, 2014
Category
Weighted Average Years
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Book Value
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Book Value
 
Developed technology
7 Years
 
$
1,080

 
$
(324
)
 
$
756

 
$
1,080

 
$
(215
)
 
$
865

 
Patents
10 Years
 
15,946

 
(5,000
)
 
10,946

 
15,946

 
(3,569
)
 
12,377

 
Trade names
7 Years
 
209

 
(62
)
 
147

 
209

 
(42
)
 
167

 
Customer relationships
3 Years
 
878

 
(439
)
 
439

 
878

 
(292
)
 
586

 
Total
 
 
$
18,113

 
$
(5,825
)
 
$
12,288

 
$
18,113

 
$
(4,118
)
 
$
13,995

 


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, 2015, 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)
2016
1,657

2017
1,602

2018
1,479

2019
1,222

Thereafter
6,328

Total
$
12,288