Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2023

Stock-Based Compensation

Schedule of share-based compensation expense

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
		2023		2022		2023		2022
General and administrative	$	172	$	218	$	111	$	636
Research and development		-		-		11		-
Total stock-based compensation	$	172	$	218	$	122	$	636

Schedule of stock option plan activity

				Weighted‑
		Weighted		Average	Aggregate
		Average		Remaining	Intrinsic
	Number of	Exercise		Contractual	Value
	Options	Price		Term (years)	(in thousands)
Outstanding at December 31, 2022	36,493	$	99.62	8.5	$	—
Granted	25,000	$	0.67	—	$	—
Exercised	-	$	—	—	$	—
Forfeited/Cancelled	(21,221)	$	59.72	—	$	—
Outstanding at September 30, 2023	40,272	$	59.21	8.7	$	—
Vested and expected to vest at September 30, 2023	40,272	$	59.21	8.7	$	—
Options exercisable at September 30, 2023	39,012	$	58.34	8.7	$	—

Schedule of assumptions used in the Black Scholes option-pricing model

	Nine Months Ended
	September 30,
	2023			2022
Expected stock price volatility		82.9	%		80.7-85.2	%
Expected life of options (years)		5.0			5.5-5.8
Expected dividend yield		—	%		—	%
Risk free interest rate		3.54	%		1.72-3.08	%

Schedule of Restricted Stock Units

		Weighted
		Average
	Number of	Grant Date Fair Value
	RSUs	Price
Outstanding at December 31, 2022	-
Granted	1,354,939	$	0.56
Vested and released	(187,500)	$	0.50
Forfeited/Cancelled	(56,250)	$	0.50
Outstanding at September 30, 2023	1,111,189	$	0.57