Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement, Noncash Expense [Abstract]

Schedule Share-based Compensation Expense

The following table summarizes the components of share-based compensation expense for the three and nine months ended September 30, 2021 and 2020 (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Research and development	$	523	$	58	$	643	$	240
General and administrative	250		171		996		850
Total share-based compensation expense	$	773	$	229	$	1,639	$	1,090

Schedule of Total Compensation Cost Related to Nonvested Awards

Total compensation cost related to non-vested awards not yet recognized and the weighted-average periods over which the awards were expected to be recognized at September 30, 2021 were as follows (in thousands):

	Stock Options		Restricted Stock Units		Restricted Stock
Unrecognized compensation cost	$	915	$	277	$	673
Expected weighted-average period in years of compensation cost to be recognized	1.82		1.23		1.88

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 nine months ended September 30, 2021 and 2020 were as follows (in thousands):

	Stock Options
	Nine Months Ended September 30,
	2021		2020
Total fair value of shares vested	$	757	$	535
Weighted average estimated fair value of shares granted	$	0.91	$	2.12