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Property and Equipment
9 Months Ended
Sep. 30, 2019
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and Equipment

The gross carrying amount and accumulated depreciation of property and equipment as of September 30, 2019 and December 31, 2018 are as follows:
 
 
September 30, 2019
 
December 31, 2018
Gross carrying amount
 
$
18,715,567

 
$
18,628,762

Accumulated depreciation
 
(18,297,400
)
 
(18,194,827
)
Property and Equipment, net
 
$
418,167

 
$
433,935



For the three months ended September 30, 2019 and 2018, depreciation expense was $62,910 and $77,697, respectively. For the nine months ended September 30, 2019 and 2018, depreciation expense was $196,736 and $236,007, respectively.