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Property and Equipment
3 Months Ended
Mar. 31, 2015
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and Equipment

The gross carrying amount and accumulated depreciation of property and equipment as of March 31, 2015 and December 31, 2014 are as follows:
 
 
March 31, 2015
 
December 31, 2014
Property and Equipment:
 
 
 
 
Gross carrying amount
 
$
19,150,365

 
$
19,015,099

Accumulated depreciation
 
(17,214,357
)
 
(16,867,911
)
Property and Equipment, net
 
$
1,936,008

 
$
2,147,188



For the three months ended March 31, 2015 and 2014, depreciation expense was $371,829 and $493,317, respectively.