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Share-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule Share-based Compensation Expense The following table summarizes the components of share-based compensation expense for the three and six months ended June 30, 2024 and 2023 (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Research and development$37 $227 $123 $414 
General and administrative200 357 568 844 
Total share-based compensation expense$237 $584 $691 $1,258 
Schedule of Total Compensation Cost Related to Nonvested Awards
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, 2024 were as follows (in thousands):
Stock OptionsRestricted Stock UnitsRestricted Stock
Unrecognized compensation cost$323 $206 $646 
Expected weighted-average period in years of compensation cost to be recognized2.090.692.00
Schedule of Fair Value of Share-based Compensation Awards
Total fair value of shares vested and the weighted average estimated fair values of shares granted for the six months ended June 30, 2024 and 2023 were as follows (in thousands):
Stock Options
Six Months Ended June 30,
20242023
Total fair value of shares vested$201 $641 
Weighted average estimated fair value of shares granted$2.16 $2.11