Stock-Based Compensation (Tables)

6 Months Ended

Jun. 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 June 30				Six months ended June 30
(in thousands)	2024		2023		2024		2023
Selling, general and administrative expense	$	115	$	179	$	272	$	351
Research and development expense		—		18		1		27
Total stock-based compensation expense	$	115	$	197	$	273	$	378

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 six months ended June 30, 2024 and 2023:

	Three months ended						Six months ended
	June 30						June 30
	2024			2023			2024			2023
Expected volatility		138.70	%		132.13	%		138.70	%		156.35	%
Expected Life of options (years)		5.51			6.08			5.51			6.23
Expected dividend yield		0	%		0	%		0	%		0	%
Risk-free interest rate		3.94	%		3.75	%		3.94	%		4.13	%