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Stockholders’ Equity (Tables)
12 Months Ended
Dec. 31, 2023
Equity [Abstract]  
Summary of Changes in Warrants Outstanding

The following is a summary of changes in warrants outstanding for the years ended December 31, 2023 and 2022:

 

   Number of
warrants
 
Outstanding at December 31,2021   1,287,404 
Exercised   (986)
Expired   (106,228)
Outstanding at December 31, 2022   1,180,190 
Expired   (936,375)
Outstanding at December 31, 2023   243,815 
Summary of Outstanding Warrants

The following is a summary of all outstanding warrants as of December 31, 2023:

 

Warrant issuance event   Number of warrants     Weighted
average
exercise
price
   

Exercise price

per share

    Remaining
term in
years
    Intrinsic
value at
date of
grant
 
                               
Settlement of deferred compensation     243,815     $ 6.32     $ 3.51 - 9.10       0.74     $ -  
Summary of Stock Options Activity

The following is a summary of stock option activity:

 

   Number of
Options
   Weighted
average
exercise price
per share
   Remaining
term in years
 
             
Outstanding on December 31, 2021   635,889   $7.41    3.8 
Issued   64,672   $5.72    8.0 
Cancelled/expired   (17,622)  $5.08      
Outstanding on December 31, 2022   682,939   $7.30    3.2 
Issued   65,468   $1.50    8.0 
Cancelled/expired   (161,316)  $7.92      
Outstanding on December 31, 2023   587,091   $6.50    3.6 
                
Exercisable, December 31, 2023   526,389   $6.73    3.2 
Summary of Fair Value of Options Using Black-Sholes Option Pricing Model

The fair value of the options issued was calculated using the Black-Sholes option pricing model, based on the criteria shown below:

 

    2023     2022  
Expected term (in years)     8       5.5 - 8  
Weighted average expected volatility     84.4 %     82.8% - 85.7 %
Weighted average risk-free interest rate     3.7 %     1.5% - 3.9 %
Expected dividends   $ -     $ -  
Weighted average grant date fair value per share   $ 1.21     $ 4.53  
Summary of Restricted Stock Award and Restricted Stock Unit Activity

The following is a summary of restricted stock award and restricted stock unit activity:

 

   Number of
shares
   Weighted
average grant
date fair value
 
Unvested at January 1, 2022   -   $- 
Granted   46,554   $4.96 
Forfeited   (4,631)  $5.38 
Unvested at December 31, 2022   41,923   $4.92 
Granted   5,000   $1.25 
Vested   (4,386)  $5.06 
Forfeited   (9,931)  $3.33 
Unvested at December 31, 2023   32,606   $4.82 
Summary of Performance Stock Unit Activity

The following is a summary of PSU activity:

 

   Number of
shares
   Weighted
average grant
date fair value
 
Unvested at January 1, 2022   -   $- 
Granted   123,512   $4.50 
Forfeited   (105,834)  $4.50 
Unvested at December 31, 2022   17,678   $4.50 
Cash settled   (17,678)  $4.50 
Granted   288,469   $1.70 
Forfeited   (179,330)  $1.67 
Unvested and expected to vest at December 31, 2023   63,888   $1.84