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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2022
Accounting Policies [Abstract]  
Useful Life of Property and Equipment The estimated useful lives of the major classes of property and equipment are as follows:
Estimated Useful Lives
Furniture and office equipment
3 to 5 years
Leasehold improvements
4 to 6 years
Laboratory equipment5 years
Property and equipment consisted of the following:
 As of December 31,
(in thousands)20222021
Furniture and office equipment$1,066 $955 
Leasehold improvements2,560 1,962 
Laboratory equipment1,056 906 
 4,682 3,823 
Less—accumulated depreciation(3,413)(3,441)
Property and equipment, net$1,269 $382 
Schedule of Antidilutive Securities Excluded from the Calculation of Basic and Diluted Loss Per Share Shares used in calculating diluted net loss per common share exclude as anti-dilutive the following share equivalents:
 December 31,
 20222021
Options to purchase Common Stock5,069,458 3,771,984 
Warrants to purchase Common Stock4,360,968 4,490,159 
Series A Convertible Preferred Stock877 877 
Series E Convertible Preferred Stock— 2,684,607 
 9,431,303 10,947,627