Stock Option and Incentive Plans (Tables)

9 Months Ended

Sep. 30, 2023

A summary of stock option activity for the nine months ended September 30, 2023, is summarized as follows:


	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)		Aggregate Intrinsic Value
Options outstanding at December 31, 2022		55,565		$	548.79
Granted		25,188			5.02
Exercised		—			—
Expired		(1,046	)		1,763.01
Forfeited		(125	)		19.20
Options outstanding at September 30, 2023		79,582			359.68		7.82	$	—
Vested and exercisable at September 30, 2023		45,793		$	532.87		7.04	$	—

The following assumptions were used to compute the fair value of stock options granted during the period:


	Three Months Ended September 30,					Nine Months Ended September 30,
	2023		2022			2023			2022
Risk free interest rate		—		3.00	%		4.00	%		2.23	%
Expected dividend yield		—		—			—			—
Expected term (in years)		—		5.44			6.06			5.91
Expected volatility		—		99.5	%		102.1	%		91.9	%