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Intangible Assets and Goodwill
9 Months Ended
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets and Goodwill
Intangible Assets and Goodwill
The following table summarizes the carrying amount of our intangible assets and goodwill, net of accumulated amortization: 
 
 
 
September 30, 2017
 
December 31, 2016
 
Estimated
Life (years)
 
Cost
 
Accumulated
Amortization
 
Net
 
Cost
 
Accumulated
Amortization
 
Net
Licenses
6-8
 
$
29

 
$
(29
)
 
$

 
$
29

 
$
(29
)
 
$

Patents
7
 
11

 
(11
)
 

 
11

 
(11
)
 

Purchased technology
6-16
 
4,711

 
(679
)
 
4,032

 
4,711

 
(439
)
 
4,272

Acquired IPR&D
Indefinite
 

 

 

 
31

 

 
31

Total
 
 
$
4,751

 
$
(719
)
 
$
4,032

 
$
4,782

 
$
(479
)
 
$
4,303

Goodwill
Indefinite
 
$
5,040

 
$
(3
)
 
$
5,037

 
$
5,040

 
$
(3
)
 
$
5,037

In the second quarter 2017, we recognized an impairment charge of $31 related to our SBC-103 acquired in-process research and development asset due to clinical results.
Amortization expense was $80 and $82 for the three months ended September 30, 2017 and 2016, respectively, and $240 and $242 for the nine months ended September 30, 2017 and 2016, respectively. Assuming no changes in the gross cost basis of intangible assets, the total estimated amortization expense for finite-lived intangible assets is $80 for the three months ending December 31, 2017, and $320 for each of the years ending December 31, 2018 through December 31, 2022.