Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2022

Schedule of expenses relating to employee and non-employee stock-based awards

The Company’s results of operations include expenses relating to stock-based awards as follows (in thousands):

	Year Ended December 31,
	2022		2021		2020
Research and development	$	1,039	$	2,161	$	2,791
General and administrative		1,653		2,071		2,956
Total	$	2,692	$	4,232	$	5,747

Employee stock options

Schedule of fair value of share-based awards to employees was estimated using Black Scholes model

	Year Ended December 31,
	2022		2021		2020
Risk-free interest rate	3.0	%	0.9	%	0.5	%
Expected volatility	83.8	%	86.7	%	82.7	%
Expected term (in years)	5.5		6.0		6.0
Expected dividend yield	0	%	0	%	0	%