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Property and Equipment | 6 Months Ended
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Jun. 30, 2018
Property Plant And Equipment [Abstract] |
Property and Equipment | Note 5. 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 to five years for all other property and equipment. Property and equipment consist of the following:
|  | June 30, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
Lab equipment |  | $ | 2,311,966 |  |  | $ | 1,914,911 |
Computer equipment |  |  | 169,366 |  |  |  | 169,366 |
Computer software |  |  | 317,747 |  |  |  | 299,227 |
Furniture and fixtures |  |  | 250,801 |  |  |  | 202,218 |
Tenant improvements |  |  | 894,756 |  |  |  | 763,898 |
Other office equipment |  |  | 121,615 |  |  |  | 63,825 |
|  |  | 4,066,251 |  |  |  | 3,413,445 |
Less accumulated depreciation |  |  | (2,643,040 | ) |  |  | (2,376,585 | )
|  | $ | 1,423,211 |  |  | $ | 1,036,860 |
Depreciation expense was $145,038 and $107,012 for the three months ended June 30, 2018 and 2017, respectively, and $266,455 and $222,459 for the six months ended June 30, 2018 and 2017, 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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