v3.7.0.1
Intangible Assets and Goodwill
3 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets and Goodwill
tangible Assets and Goodwill
The following table summarizes the carrying amount of our intangible assets and goodwill, net of accumulated amortization:

 
 
 
March 31, 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

 
(519
)
 
4,192

 
4,711

 
(439
)
 
4,272

Acquired IPR&D
Indefinite
 
31

 

 
31

 
31

 

 
31

Total
 
 
$
4,782

 
$
(559
)
 
$
4,223

 
$
4,782

 
$
(479
)
 
$
4,303

Goodwill
Indefinite
 
$
5,040

 
$
(3
)
 
$
5,037

 
$
5,040

 
$
(3
)
 
$
5,037


Amortization expense was $80 for the three months ended March 31, 2017 and 2016. Assuming no changes in the gross cost basis of intangible assets, the total estimated amortization expense for finite-lived intangible assets is $240 for the nine months ending December 31, 2017, and $320 for each of the years ending December 31, 2018 through December 31, 2022.