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Property and Equipment
 6 Months Ended
Jun. 30, 2017
Property Plant And Equipment [Abstract]  
Property and Equipment

Note 4. Property and Equipment

Depreciation and amortization of property and equipment is calculated on the straight-line method based on estimated useful lives of six to ten years for tenant improvements and three years for all other property and equipment.  Property and equipment consist of the following:

 

 

June 30,

 

 

December 31,

 

 

 

2017

 

 

2016

 

Lab equipment

 

$

1,826,233

 

 

$

1,314,060

 

Computer equipment

 

 

165,415

 

 

 

165,415

 

Computer software

 

 

299,227

 

 

 

299,227

 

Furniture and fixtures

 

 

201,717

 

 

 

184,233

 

Tenant improvements

 

 

763,898

 

 

 

763,898

 

Other office equipment

 

 

63,824

 

 

 

20,591

 

 

 

 

3,320,314

 

 

 

2,747,424

 

Less accumulated depreciation

 

 

(2,162,797

)

 

 

(1,940,338

)

 

 

$

1,157,517

 

 

$

807,086

 

Depreciation expense was $107,012 and $118,911 for the three months ended June 30, 2017 and 2016, respectively, and $222,459 and $236,357 for the six months ended June 30, 2017 and 2016, respectively.