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Stock Compensation (Tables)

6 Months Ended

Jun. 30, 2021

Sharebased Payment Arrangement [Line Items]

Schedule of Stock Based Compensation Expense

		Three months ended June 30,								Six months ended June 30,
		2021				2020				2021				2020
Research and development		$	45			$	176			$	122			$	231
General and administrative			366				51				409				(1	)
		$	411			$	227			$	531			$	230

Summary of Stock Options

Stock option activity under the Plans is set forth below:

										Weighted-
		Shares								Average
		Available				Total Options				Exercise
		for Grant				Outstanding				Price
Balance—January 1, 2021			489,797				452,165			$	5.35
Assumed in reverse recapitalization			—				178,732				178.64
Granted			(186,482	)			186,482				20.99
Exercised			—				(10,654	)			4.60
Cancelled and forfeited			5,667				(6,316	)			18.36
Balance—June 30, 2021			308,982				800,409				47.70

Summary of Information About Stock Options Outstanding

The following table summarizes information about stock options outstanding at June 30, 2021:

						Weighted
						Average				Weighted
						Remaining				Average				Aggregate
						Contractual				Exercise				Intrinsic
		Shares				Life (In Years)				Price				Value
Options outstanding			800,409				8.46			$	47.70			$	2,594,131
Vested and expected to vest			799,823				8.46			$	47.63			$	2,593,281
Exercisable			366,374				7.64			$	89.59			$	1,133,181

Employee

Sharebased Payment Arrangement [Line Items]

Summary of Grant Date Fair Value Assumptions

The fair value of employee stock options was estimated using the following assumptions for the six months ended June 30, 2021:

Expected term (in years)			6.0 – 6.1
Expected volatility			67%
Risk-free interest rate			1.0% – 1.1%
Dividends			0%

Non-Employee

Sharebased Payment Arrangement [Line Items]

Summary of Grant Date Fair Value Assumptions

The fair value of non-employee stock options was estimated using the following assumptions for the six months ended June 30, 2021:

Expected term (in years)			10
Expected volatility			66	%
Risk-free interest rate			1.50	%
Dividends			0	%

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