Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of the performance-based stock options activity

	Options Outstanding
	Number of Shares			Weighted Average Exercise Price		Weighted - Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value (in thousands)
Balance, January 1, 2023		6,169,180		$	2.25		7.80	$	-
Options granted		3,017,696		$	1.85
Options exercised		(44,413	)	$	0.71
Options cancelled/forfeited		(238,873	)	$	0.78
Balance, March 31, 2023		8,903,590		$	2.16		8.37	$	2,523
Vested and expected to vest, March 31, 2023		8,903,590		$	2.16		8.37	$	2,523
Exercisable – March 31, 2023		3,058,616		$	1.68		6.69	$	2,189

Schedule of the performance-based stock options activity

	Options Outstanding		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value
Balance, January 1, 2023		463,959	$	1.42		8.06	$	-
Options granted		50,000	$	1.92		-	$	-
Balance, March 31, 2023		513,959	$	1.47		8.02	$	337,635
Vested and expected to vest, March 31, 2023		513,959	$	1.47		8.02	$	337,635
Exercisable		308,959	$	0.73		7.18	$	337,635

Schedule of RSUs activity

	Number of Shares			Weighted Average Grant date Fair Value
Unvested restricted stock units at January 1, 2023		2,617,445		$	0.79
Vested		(625	)	$	3.54
Unvested restricted stock units at March 31, 2023		2,616,820		$	0.79
Vested and unreleased		-		$	-
Outstanding restricted stock units at March 31, 2023		2,616,820		$	0.79

Schedule of stock-based compensation expense

	Three Months Ended March 31
	2023		2022
Research and development	$	468	$	222
General and administrative		799		556
Total	$	1,267	$	778

Schedule of fair value of stock options was estimated using a Black-Scholes option-pricing model

	Three Months Ended March 31,
	2023	2022
Expected term (in years)	5.25 – 6.08	1.00 – 6.08
Expected volatility	103.34% – 104.07%	63.41% – 88.27%
Risk-free interest rate	3.45% – 4.25%	1.40% – 2.35%
Expected dividend yield	—	—