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Stock Plans (Tables)

9 Months Ended

Sep. 30, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of our option activity

Schedule of our option activity
		Options (in thousands)				Weighted Average Exercise Price per share				Weighted Average Remaining Option Term (in years)				Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2022			927			$	7.97				8.34			$	-
Granted			1,475				0.93				-				235
Forfeited or expired			(91	)			23.01				-				-
Outstanding at September 30, 2023			2,311				2.89				8.84				213
Exercisable at September 30, 2023			2,311				2.89				8.84				213

Schedule of the stock-based compensation expense

Schedule of the stock-based compensation expense
		Three Months Ended								Nine Months Ended
		September 30,								September 30,
(in thousands)		2023				2022				2023				2022
Research and development		$	52			$	306			$	106			$	553
Selling, general and administrative			359				217				859				414
Total stock-based compensation		$	411			$	523			$	965			$	967

Schedule of assumptions to estimate the fair value of options

Schedule of assumptions to estimate the fair value of options
		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2023				2022				2023				2022
Weighted-average risk-free interest rate			4.08	%			-	%			4.06	%			1.91	%
Expected dividend payments			-				-				-				-
Expected holding period (years)1			4.8				-				5.3				5.3
Weighted-average volatility factor2			1.14				-				1.10				1.16
Estimated forfeiture rates for options granted3			7.5	%			-	%			7.0	%			5.6	%

(1)	Expected holding period is based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards, vesting schedules and the expectations of future employee behavior.
(2)	Weighted average volatility is based on the historical volatility of our common stock.
(3)	Estimated forfeiture rates are based on historical data.

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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