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Goodwill and Other Intangible Assets
9 Months Ended
Sep. 30, 2018
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, 2018 and December 31, 2017 are as follows: 
 
 
September 30, 2018
 
December 31, 2017
Goodwill
 
$
4,150,339

 
$
4,150,339

Other intangible assets:
 
 

 
 

Gross carrying amount
 
$
3,879,547

 
$
3,816,402

Accumulated amortization
 
(3,774,172
)
 
(3,674,771
)
Net carrying amount
 
$
105,375

 
$
141,631



For the three months ended September 30, 2018 and 2017, amortization expense was $28,581 and $40,533, respectively. For the nine months ended September 30, 2018 and 2017, amortization expense was $99,401 and $121,306, respectively.