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Property and Equipment | 12 Months Ended
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Dec. 31, 2016
Property Plant And Equipment [Abstract] |
Property and Equipment |
(2) | 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:
|  | As of December 31, |
|  | 2016 |  |  | 2015 |
Lab equipment |  | $ | 1,314,060 |  |  | $ | 1,284,626 |
Computer equipment |  |  | 165,415 |  |  |  | 182,266 |
Computer software |  |  | 299,227 |  |  |  | 302,549 |
Furniture and fixtures |  |  | 184,233 |  |  |  | 184,233 |
Tenant improvements |  |  | 763,898 |  |  |  | 763,898 |
Other office equipment |  |  | 20,591 |  |  |  | 38,753 |
|  |  | 2,747,424 |  |  |  | 2,756,325 |
Less accumulated depreciation |  |  | (1,940,338 | ) |  |  | (1,729,541 | )
|  | $ | 807,086 |  |  | $ | 1,026,784 |
Depreciation expense was $495,347, $458,734 and $371,603 for the years ended December 31, 2016, 2015 and 2014, respectively.

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- Definition The entire disclosure for intangible assets and long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References No definition available. + Details
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