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Property and Equipment
9 Months Ended
Sep. 30, 2021
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, 2021 and December 31, 2020 are as follows:
September 30, 2021December 31, 2020
Gross carrying amount$18,876,633 $18,791,841 
Accumulated depreciation(18,683,605)(18,594,821)
Property and Equipment, net$193,028 $197,020 

For the three months ended September 30, 2021 and 2020, depreciation expense was $29,838 and $44,958, respectively. For the nine months ended September 30, 2021 and 2020, depreciation expense was $100,470 and $135,679, respectively.