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Goodwill and Other Intangible Assets
9 Months Ended
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets

The gross carrying amount and accumulated amortization of goodwill and other intangible assets as of September 30, 2017 and December 31, 2016 are as follows: 
 
 
September 30, 2017
 
December 31, 2016
Goodwill
 
$
4,150,339

 
$
4,150,339

Other intangible assets:
 
 

 
 

Gross carrying amount
 
$
3,789,435

 
$
3,725,437

Accumulated amortization
 
(3,637,288
)
 
(3,515,981
)
Net carrying amount
 
$
152,147

 
$
209,456



For the three months ended September 30, 2017 and 2016, amortization expense was $40,533 and $39,186, respectively. For the nine months ended September 30, 2017 and 2016, amortization expense was $121,306 and $121,421, respectively.