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Goodwill, Other Intangible Assets and Other Assets
9 Months Ended
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill, Other Intangible Assets and Other Assets
Goodwill and Other Intangible Assets
Goodwill
The carrying amount of the Company's goodwill was $41.0 million at September 30, 2017 and December 31, 2016.
Other Intangible Assets
Other intangible assets include the value assigned to completed technology and a trade name acquired with the acquisition of Evolution Robotics, and the value assigned to customer relationships and the reacquired distribution rights acquired with the acquisition of the iRobot-related distribution business of SODC. The estimated useful lives for all of these intangible assets are nine months to thirteen years. The intangible assets are being amortized on a straight-line basis, which is consistent with the pattern that the economic benefits of the intangible assets are expected to be utilized.
Intangible assets at September 30, 2017 and December 31, 2016 consisted of the following:
 
September 30, 2017
 
December 31, 2016
 
Cost
 
Accumulated
Amortization
 
Net
 
Cost
 
Accumulated
Amortization
 
Net
 
(In thousands)
Completed technology
$
26,900

 
$
17,286

 
$
9,614

 
$
26,900

 
$
14,693

 
$
12,207

Tradename
100

 
100

 

 
100

 
100

 

Customer relationships
4,490

 
173

 
4,317

 

 

 

Reacquired distribution rights
4,150

 
2,766

 
1,384

 

 

 

Total
$
35,640

 
$
20,325

 
$
15,315

 
$
27,000

 
$
14,793

 
$
12,207


Amortization expense related to acquired intangible assets was $2.3 million and $0.9 million for the three months ended September 30, 2017 and October 1, 2016, respectively. Amortization expense related to acquired intangible assets was $5.5 million and $2.6 million for the nine months ended September 30, 2017 and October 1, 2016, respectively. The estimated future amortization expense is expected to be as follows (in thousands):
 
Remainder of 2017
$
2,334

2018
3,803

2019
3,163

2020
1,245

2021
1,245

Thereafter
3,525

Total
$
15,315