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Property, Plant and Equipment, Net
 9 Months Ended
Sep. 30, 2019
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT, net
7.PROPERTY, PLANT AND EQUIPMENT, net

 

Property, plant and equipment consisted of the following:

 

   Estimated Useful Lives
(in years)		  As of
September 30, 2019		   As of
December 31, 2018		 
Buildings and improvements  10-39  $17,078,829   $17,018,316 
Laboratory and manufacturing equipment  3-10   15,279,172    15,092,252 
Office furniture and equipment  3-10   731,397    731,510 
Construction in progress  n/a   477,400    91,067 
Land  n/a   516,867    516,867 
Property, plant and equipment, gross      34,083,665    33,450,012 
Accumulated depreciation      (9,104,818)   (7,422,463)
Property, plant and equipment, net     $24,978,847   $26,027,549 

 

As of September 30, 2019 and December 31, 2018, construction in progress consisted principally of down payments towards manufacturing equipment. During the three-month periods ended September 30, 2019 and 2018, $4,770 and $11,824 of property, plant and equipment was disposed of, respectively. During the nine-month periods ended September 30, 2019 and 2018, $11,164 and $18,554 of property, plant and equipment was disposed of, respectively. Depreciation expense was $562,722 and $377,828 during the three-month periods ended September 30, 2019 and 2018, respectively, and $1,691,049 and $938,416 during the nine-month periods ended September 30, 2019 and 2018, respectively.