Intangible Assets
 12 Months Ended
Dec. 31, 2016
Intangible Assets  
Intangible Assets

4 — Intangible Assets

 

The following table summarizes the components of intangible asset balances:

 

 

 

As of December 31,

 

 

 

2016

 

2015

 

Patents — in use

 

$
168,383

 

$
168,383

 

Patents — in process

 
67,071

 
47,474

 

Internally developed software — in use

 
148,967

 
148,967

 

Internally developed software — in process

 
718,602

 

—

 

Trademarks

 
23,017

 
17,730

 

 

 

 

 

 

 

 

 
1,126,040

 
382,554

 

Accumulated amortization

 
(207,328

)
(189,311

)

 

 

 

 

 

 

Total

 

$
918,712

 

$
193,243

 

 

 

 

 

 

 

 

 

 

Amortization expense of intangible assets was $18,017, $36,006 and $38,499 in the years ended December 31, 2016, 2015 and 2014, respectively. During 2015, we recorded an impairment charge of $55,433 on patents related to certain of our IV sets. This charge is included in general and administrative expense in our Statements of Operations.

 

Expected annual amortization expense for the next five years related to intangible assets is as follows (excludes in process intangible assets):

 

2017

 

$
10,538 

 

2018

 

$
10,538 

 

2019

 

$
10,538 

 

2020

 

$
10,538 

 

2021

 

$
10,538