Property and Equipment

6 Months Ended

Jun. 30, 2018

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, 2018 and December 31, 2017 are as follows:

	June 30, 2018			December 31, 2017
Gross carrying amount	$	18,576,492		$	18,563,071
Accumulated depreciation	(18,071,912		)	(17,926,959		)
Property and Equipment, net	$	504,580		$	636,112

For the three months ended June 30, 2018 and 2017, depreciation expense was $71,441 and $135,669, respectively. For the six months ended June 30, 2018 and 2017, depreciation expense was $158,310 and $321,754, respectively.