Stock Based Awards (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity

The following table summarizes stock option transactions for the 2007 Plan and 2015 Plan, collectively, for the years ended December 31, 2023 and 2022 (table in thousands, except per share amounts):

	Number of Shares Available for Grant			Total Options Outstanding			Weighted Average Exercise Price		Aggregate Intrinsic Value
Balance at December 31, 2021		629			205		$	23.76	$	-
Granted		(158	)		158			5.04		-
Expired		12			(12	)		33.24		-
Cancelled		1			(1	)		15.36		9
Balance at December 31, 2022		484			350		$	15.36	$	9
Granted		(209	)		209			2.67		-
Expired		-			(1	)		22.89		-
Balance at December 31, 2023		275			558			10.57		-

Schedule of Weighted Average Assumptions Used for Grants

Assumptions:
Weighted average per share grant date fair value	$	2.67
Risk-free interest rate		3.96	%
Expected dividend yield		0.00	%
Expected volatility		112.02	%
Expected terms (in years)		5.77

 

Assumptions:
Weighted average per share grant date fair value	$	12.01
Risk-free interest rate		2.89	%
Expected dividend yield		0.00	%
Expected volatility		111.96	%
Expected terms (in years)		5.83

 

Schedule of Common Stock Reserved for Future Issuance

The following table presents information concerning common stock available for future issuance as of December 31, (in thousands):

	2023		2022
Stock options issued and outstanding		558		350
Shares authorized for future option grants		275		484
Warrants outstanding		11		20
Total		844		854