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Share-Based Compensation
 6 Months Ended
Jun. 30, 2025
Share-Based Payment Arrangement [Abstract]  
Share-Based Compensation Share-Based Compensation
Share-Based Compensation
The Company utilizes share-based compensation in the form of stock options, restricted stock, restricted stock units and warrants. The following table summarizes the components of share-based compensation expense for the three and six months ended June 30, 2025 and 2024 (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2025202420252024
Research and development$27 $37 $153 $123 
General and administrative212 200 616 568 
Total share-based compensation expense$239 $237 $769 $691 

Total compensation cost related to unvested awards not yet recognized and the weighted-average periods over which the awards were expected to be recognized at June 30, 2025 were as follows (in thousands):
Stock OptionsRestricted Stock UnitsRestricted Stock
Unrecognized compensation cost$310 $167 $732 
Expected weighted-average period in years of compensation cost to be recognized2.000.512.11
Total fair value of shares vested and the weighted average estimated fair values of shares granted for the six months ended June 30, 2025 and 2024 were as follows (in thousands):
Stock OptionsWarrants
Six Months Ended June 30,Six Months Ended June 30,
2025202420252024
Total fair value of shares vested$264 $201 $150 $— 
Weighted average estimated fair value of shares granted$2.60 $2.16 $— $— 

Valuation Assumptions
The fair value of stock options and warrants at the date of grant was estimated using the Black-Scholes option pricing model. The expected volatility is based upon historical volatility of the Company’s stock. The expected term for the options is based upon observation of actual time elapsed between date of grant and exercise of options for all employees. The expected term for the warrants is based upon the contractual term of the warrants.