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Stock Based Compensation (Tables)
12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Compensation Expense
A summary of stock compensation expense by category, for the years ended December 31, 2023 and 2022, is as follows:

Year Ended December 31,
Stock Based Compensation20232022
Options$124 $61 
RSUs380 — 
Total$504 $61 

A summary of stock compensation by department, for the years ended December 31, 2023 and 2022 is as follows:

Year Ended December 31,
Stock Based Compensation20232022
Research and Development$— $(64)
General & Administrative504 125 
Total$504 $61 
Schedule of Options Granted, Exercised, Expired and Forfeited
A summary of stock options expired and forfeited under our plans and options outstanding as of, and changes made during, the years ended December 31, 2023 and 2022 is presented below:
Outstanding
Exercisable
Number of Options
Weighted Average Exercise Price
Number of Options
Weighted Average Exercise Price
Options outstanding and exercisable, December 31, 202127,169 113.63 7,169 294.63 
Vested— — 3,332 97.56 
Expired(501)410.18 (501)410.18 
Forfeited(10,000)48.75 — — 
Options outstanding and exercisable, December 31, 202216,668 $29.25 10,000 $223.11 
Vested— — 3,336 48.75 
Expired(6,668)285.89 (6,668)285.89 
Options outstanding and exercisable, December 31, 202310,000 $48.75 6,668 $48.75