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Supplementary Balance Sheet Information | 12 Months Ended
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Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplementary Balance Sheet Information | Supplementary Balance Sheet Information Property and Equipment Fixed assets consist of furniture and office equipment, leasehold improvements and laboratory equipment. Depreciation expense for property and equipment for the years ended December 31, 2020 and 2019 was $466,009 and $494,232, respectively. Property and equipment consisted of the following:
| As of December 31,
| 2020 |  | 2019
Furniture and office equipment | $ | 797,739 |  |  | $ | 775,030 |
Leasehold improvements | 1,962,230 |  |  | 1,962,230 |
Laboratory equipment | 867,750 |  |  | 744,856 |
| 3,627,719 |  |  | 3,482,116 |
Less—accumulated depreciation | (3,004,025) |  |  | (2,604,293) |
Property and equipment, net | $ | 623,694 |  |  | $ | 877,823 |
Accrued Liabilities Accrued liabilities consisted of the following:
| As of December 31,
| 2020 |  | 2019
Accrued compensation | $ | 1,523,321 |  |  | $ | 1,003,383 |
Preferred stock dividend | 389,495 |  |  | 365,255 |
Clinical trials | 1,557,134 |  |  | 1,504,660 |
Research agreements and services | 66,593 |  |  | 181,408 |
Director fees | 92,500 |  |  | 67,500 |
Professional fees and outside services | 38,180 |  |  | 21,000 |
Patent, license and other fees | 117,440 |  |  | 69,950 |
Other accrued liabilities | 66,100 |  |  | 46,905 |
Total accrued liabilities | $ | 3,850,763 |  |  | $ | 3,260,061 |

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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