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Intangible Assets
 9 Months Ended
Sep. 30, 2015
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets
Intangible Assets

Intangible assets as of September 30, 2015 and December 31, 2014 consisted of the following:

 
Estimated useful lives
 
September 30, 2015
 
December 31, 2014
Tradename
5 to 7 years
 
$
555

 
$
555

Patents and technological know-how
10 years
 
5,850

 
5,850

Proprietary software
3 to 15 years
 
4,341

 
4,341

Other
5 years
 
324

 
324

 
 
 
11,070

 
11,070

Accumulated amortization
 
 
(4,118
)
 
(3,174
)
 
 
 
$
6,952

 
$
7,896




The amortization of intangible assets for the three and nine months ended September 30, 2015 and September 30, 2014 was as follows:
 
Three months ended September 30,
 
Nine months ended September 30,
 
2015
 
2014
 
2015
 
2014
Amortization of intangible assets
$
314

 
$
268

 
$
944

 
$
701


The estimated future amortization expense of intangible assets is as follows:
Years ending December 31,
 
2015 (remainder)
$
314

2016
1,121

2017
925

2018
851

2019
778

Thereafter
2,963

 
$
6,952