Stock Plan (Tables)

6 Months Ended

Jun. 30, 2022

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Schedule of Stock Options Activity

The following table summarizes option activity for the six-month period ended June 30, 2022:

				Options Outstanding
									Weighted-
							Weighted		Average		Aggregate
	Shares						Average		Remaining		Intrinsic
	Available			Number of			Exercise		Contractual Life		Value
	for Grant			Options			Price		(in years)		(in 000s)
Balances at December 31, 2021		4,951,680			4,246,007		$	8.22		6.86	$	68,506
Shares reserved for issuance		1,363,084			—			—
Options granted		(1,267,997	)		1,267,997		$	16.33
Options forfeited / cancelled		8,339			(8,339	)	$	26.51
Options exercised		—			(170,472	)	$	1.06
Balances at June 30, 2022 (unaudited)		5,055,106			5,335,193		$	10.32		7.23	$	36,326
At June 30, 2022
Vested and expected to vest					5,353,193		$	10.32		7.23	$	36,326
Exercisable					3,009,863		$	5.85		5.92	$	30,124

Schedule of Estimated Fair Value of Stock Options

The Company estimated the fair value of the options using the Black-Scholes options valuation model. The fair value of the options is being amortized on a straight-line basis over the requisite service period of the awards. The fair value was estimated using the following assumptions:

	Six Months Ended	Six Months Ended
	June 30,	June 30,
	2022	2021
Risk-free interest rate	1.48% - 2.93%	0.35% - 1.22%
Expected life (in years)	5.50 - 6.44	5.50 - 6.43
Dividend yield	0%	0%
Expected volatility	77.00%	79.00% - 79.90%

Stock-based Compensation Expense Related to Options Granted and Common Stock Issued under 2020 ESPP Recorded and Allocated

Stock-based compensation expense recorded under ASC 718 related to stock options granted and common stock issued under the 2020 ESPP were allocated to research and development and general and administrative expense as follows:

	For the Three Months Ended				For the Six Months Ended
	June 30,		June 30,		June 30,		June 30,
	2022		2021		2022		2021
Research and development	$	807	$	282	$	1,456	$	533
General and administrative		1,711		868		3,239		1,244
Total stock-based compensation	$	2,518	$	1,150	$	4,695	$	1,777

ESPP

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Schedule of Estimated Fair Value of Stock Options

The weighted average assumptions used to estimate the fair value of stock options granted and stock purchase rights under the ESPP are as follows:

	Six Months Ended	Six Months Ended
	June 30,	June 30,
	2022	2021
Risk-free interest rate	1.57%	0.02%
Expected life (in years)	0.49	0.50
Dividend yield	0%	0%
Expected volatility	77.00%	79.00%