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Supplementary Balance Sheet Information
 12 Months Ended
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,
 20202019
Furniture and office equipment$797,739 $775,030 
Leasehold improvements1,962,230 1,962,230 
Laboratory equipment867,750 744,856 
 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,
 20202019
Accrued compensation$1,523,321 $1,003,383 
Preferred stock dividend389,495 365,255 
Clinical trials1,557,134 1,504,660 
Research agreements and services66,593 181,408 
Director fees92,500 67,500 
Professional fees and outside services38,180 21,000 
Patent, license and other fees117,440 69,950 
Other accrued liabilities66,100 46,905 
Total accrued liabilities$3,850,763 $3,260,061