Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Schedule of stock option activity

				Option Outstanding					Weighted -
	Shares Available for Grant			Number of Shares			Weighted Average Exercise Price		Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value
Balance, January 1, 2021		430,893			2,983,574		$	0.71		9.52	$	5,599,957
Shares available for grant cancelled		(407,864	)
Shares authorized		4,400,000
Options granted		(145,753	)		145,753		$	2.59
Options exercised		—			(323,740	)	$	0.72
Options cancelled/forfeited		145,204			(145,204	)	$	0.72
Balance, December 31, 2021		4,422,480			2,660,383		$	0.81		8.54	$	18,731,908
Vested and expected to vest, December 31, 2021					2,660,383		$	0.81		8.54	$	18,731,908
Exercisable					1,568,645		$	0.71		8.74	$	13,642,291

Schedule of stock-based compensation expense

	Year Ended December 31,
	2021		2020
Research and development	$	612	$	488
General and administrative		436		722
Total	$	1,048	$	1,210

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

	Year Ended December 31,
	2021	2020
Expected term (in years)	5.29 – 6.08	5.00 – 6.06
Expected volatility	75.27% – 75.79%	74.27% – 75.61%
Risk-free interest rate	0.65% – 0.80%	0.27% – 0.45%
Expected dividend yield	—	—