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Goodwill and Intangible Assets, Net (Tables)
 12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
Goodwill and changes in the carrying amount of goodwill were as follows: 
(In thousands)
 
Balance at December 31, 2014
$
30,739

Goodwill acquired during the period (1)
12,564

Foreign exchange effects
(187
)
Balance at December 31, 2015
43,116

Foreign exchange effects
(64
)
Balance at December 31, 2016
$
43,052


(1) 
During 2015, we recognized $12.6 million of goodwill related to the Ecolink Intelligent Technology, Inc. acquisition. Please refer to Note 22 for further information about this acquisition.
Schedule of Components of Intangible Assets
The components of intangible assets, net were as follows: 
 
December 31,
 
2016
 
2015
(In thousands)
Gross (1)
 
Accumulated
Amortization (1)
 
Net (1)
 
Gross (1)
 
Accumulated
Amortization (1)
 
Net (1)
Distribution rights (10 years)
$
302

 
$
(119
)
 
$
183

 
$
312

 
$
(96
)
 
$
216

Patents (10 years)
12,038

 
(4,775
)
 
7,263

 
11,425

 
(4,737
)
 
6,688

Trademarks and trade names
(10 years) (2)
2,400

 
(1,310
)
 
1,090

 
2,401

 
(1,053
)
 
1,348

Developed and core technology (5-15 years) (2)
12,585

 
(4,068
)
 
8,517

 
12,587

 
(2,144
)
 
10,443

Capitalized software development costs (2 years)
142

 
(5
)
 
137

 
167

 
(97
)
 
70

Customer relationships
(10-15 years) (2)
27,703

 
(16,344
)
 
11,359

 
27,715

 
(13,554
)
 
14,161

Total intangible assets, net
$
55,170

 
$
(26,621
)
 
$
28,549

 
$
54,607

 
$
(21,681
)
 
$
32,926

 
(1) 
This table excludes the gross value of fully amortized intangible assets totaling $10.2 million and $9.0 million on December 31, 2016 and 2015, respectively.

(2) 
During the third quarter of 2015, we purchased a trade name valued at $0.4 million, which is being amortized ratably over seven years; developed technology valued at $9.1 million, which is being amortized over a weighted average period of approximately five years; and customer relationships valued at $1.3 million, which are being amortized ratably over five years. Refer to Note 22 for further information regarding our purchase of these intangible assets.
Intangible Assets Amortization Expense
Amortization expense by income statement caption was as follows:
 
 
Year Ended December 31,
(In thousands)
2016
 
2015
 
2014
Cost of sales
$
76

 
$
123

 
$
153

Selling, general and administrative
6,198

 
4,719

 
4,009

Total amortization expense
$
6,274

 
$
4,842

 
$
4,162
Schedule of Estimated Future Amortization Expense
Estimated future amortization expense related to our intangible assets at December 31, 2016, is as follows: 
(In thousands)
 
2017
$
6,415

2018
6,390

2019
6,312

2020
5,222

2021
2,932

Thereafter
1,278

Total
$
28,549