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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option Activity

The following summarizes stock option activity:

										Weighted
						Weighted				Average
						Average				Remaining				Aggregate
		Number of				Exercise				Contractual				Intrinsic
		Options				Price				Term				Value
										(In years)				(In thousands)
Outstanding—December 31, 2019			2,117,106			$	2.52				8.7			$	2,825
Granted			1,098,542			$	16.88
Exercised			(53,134	)		$	1.47
Forfeited and Canceled			(406,412	)		$	2.38
Outstanding—December 31, 2020			2,756,102			$	8.28				8.6			$	57,090
Options Exercisable—December 31, 2020			1,925,666			$	3.00				8.1			$	50,109

Schedule of Assumptions Using Black-Scholes to Estimate Fair Value of Each Awards

The fair value of each award is estimated using Black-Scholes based on the following assumptions:

		Year Ended December 31,
		2020				2019
Expected term (years)		5.0-6.1				5.1-6.1
Expected volatility		85%				80%
Risk-free interest rate		0.25%-0.53%				1.8%-2.5%
Expected dividend			—				—

Summary of Stock-Based Compensation Expense

Stock-based compensation expense is classified as follows (in thousands):

		Year Ended December 31,
		2020				2019
Research and development		$	390			$	215
General and administrative			1,398				523
Total stock-based compensation expense		$	1,788			$	738

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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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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