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Property and Equipment
6 Months Ended
Jun. 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 June 30, 2021 and December 31, 2020 are as follows:
June 30, 2021December 31, 2020
Gross carrying amount$18,845,590 $18,791,841 
Accumulated depreciation(18,659,114)(18,594,821)
Property and Equipment, net$186,476 $197,020 

For the three months ended June 30, 2021 and 2020, depreciation expense was $30,867 and $44,778, respectively. For the six months ended June 30, 2021 and 2020, depreciation expense was $70,632 and $90,721, respectively.