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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2023

Stock-Based Compensation [Abstract]

Schedule of stock option activity

		Options Outstanding								Weighted -
		Number of Shares				Weighted Average Exercise Price				Average Remaining Contractual Life (Years)				Aggregate Intrinsic Value (in thousands)
Balance, January 1, 2023			6,169,180			$	2.25				7.80			$	—
Options granted			4,375,696			$	1.76
Options exercised			(495,816	)		$	0.71
Options cancelled/forfeited			(703,523	)		$	1.65
Balance, June 30, 2023			9,345,537			$	2.15				8.75			$	1,132
Vested and expected to vest, June 30, 2023			9,345,537			$	2.15				8.75			$	1,132
Exercisable, June 30, 2023			2,786,521			$	1.95				7.50			$	1,007

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
Options cancelled/forfeited			(16,650	)		$	1.92
Balance, June 30, 2023			497,309			$	1.45				7.70			$	202
Vested and expected to vest, June 30, 2023			497,309			$	1.45				7.70			$	202
Exercisable, June 30, 2023			313,959			$	0.78				6.96			$	202

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
Granted			50,000			$	1.50
Vested			(1,309,356	)		$	0.79
Forfeited			(178,318	)		$	0.79
Unvested restricted stock units at June 30, 2023			1,179,771			$	0.82
Vested and unreleased			—			$	—
Outstanding restricted stock units at June 30, 2023			1,179,771			$	0.82

Schedule of stock-based compensation expense

		Three Months Ended June 30,								Six Months Ended June 30,
		2023				2022				2023				2022
General and administrative		$	900			$	480			$	1,699			$	1,036
Research and development			491				585				959				807
Total		$	1,391			$	1,065			$	2,658			$	1,843

Schedule of fair value of stock options was estimated using a black-scholes option-pricing model

			Three Months Ended June 30,								Six Months Ended June 30,
			2023				2022				2023				2022
Expected term (in years)			5.44-6.08				2.68-6.07				5.25-6.08				1.00-6.08
Expected volatility			103.31%-108.98%				83.30%-85.19%				103.31%-108.98%				63.41%-88.27%
Risk-free interest rate			3.49% - 4.05%				2.72% - 2.84%				3.45% - 4.25%				1.40% – 2.84%
Expected dividend yield			—				—				—				—

		Three and Six Months Ended June 30,
		2023				2022
Expected term (in years)			0.50				0.50
Expected volatility			266.24	%			75.60	%
Risk-free interest rate			5.39	%			1.81	%
Expected dividend yield			—				—

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Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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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