Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2024

Stock-Based Compensation [Abstract]

Classification of Stock-Based Compensation Expense

The following table presents the classification of stock-based compensation expense recognized for the periods below:

	Three months ended September 30				Nine months ended September 30
(in thousands)	2024		2023		2024		2023
Selling, general and administrative expense	$	99	$	133	$	363	$	484
Research and development expense		2		2		11		29
Total stock-based compensation expense	$	101	$	135	$	374	$	513

Weighted Average Assumptions used in Black-Scholes Option Pricing Model

The weighted-average assumptions used in the Black-Scholes option-pricing model are as follows for the stock options granted during the three and nine months ended September 30, 2024 and 2023:

	Three months ended						Nine months ended
	September 30						September 30
	2024			2023			2024			2023
Expected volatility		138.70	%		131.06	%		138.70	%		152.59	%
Expected Life of options (years)		5.51			6.25			5.51			6.19
Expected dividend yield		0	%		0	%		0	%		0	%
Risk-free interest rate		3.94	%		4.29	%		3.94	%		4.16	%