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Stock Plan (Tables)

12 Months Ended

Dec. 31, 2021

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

Schedule of Stock Options Activity

The following table summarizes option activity for the year ended December 31, 2021:

						Options Outstanding
														Weighted- Average
										Weighted				Remaining				Aggregate
		Shares				Number				Average				Contractual				Intrinsic
		Available				of				Exercise				Life				Value
		for Grant				Options				Price				(in years)				(in 000s)
Balances, December 31, 2020			4,609,725				4,090,970			$	3.14				7.13			$	238,792
Shares reserved for issuance			1,343,334				–
Options retired under 2013 Equity Plan			(237,542	)			–
Options granted			(807,180	)			807,180			$	29.22
Options forfeited / cancelled			43,343				(43,343	)		$	6.89
Options exercised			–				(608,800	)		$	2.03
Balances, December 31, 2021			4,951,680				4,246,007			$	8.22				6.86			$	68,506
At December 31, 2021
Vested and expected to vest							4,246,007			$	8.22				6.86			$	68,506
Exercisable							2,668,149			$	3.48				5.80			$	52,952

Schedule of Estimated Fair Value of Stock Options

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

	Year Ended December 31,
	2021				2020				2019
Risk-free interest rate	0.35% - 1.30%				0.31% - 1.51%				1.49% - 2.51%
Expected life (in years)	5.50 - 6.44				4.92 - 6.40				5.27 - 6.37
Dividend yield	0%				0%				0%
Expected volatility	76.50% - 79.90%				70.70% - 77.60%				72.07% - 72.69%

Stock-based Compensation Expense Related to Options Granted Recorded and Allocated

Stock-based compensation expense recorded under ASC 718 related to options granted was allocated to research and development and general and administrative expense as follows:

		For the Years Ended December 31,
		2021				2020				2019
Research and development		$	1,440			$	836			$	302
General and administrative			3,900				1,097				606
Total stock-based compensation		$	5,340			$	1,933			$	908

2020 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:

	Year Ended December 31, 2021
Risk-free interest rate	0.04%
Expected life (in years)		0.50
Dividend yield	0%
Expected volatility	77.83%

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