The 2018 Omnibus Incentive Plan (the 2018 Plan) provides for an increase in the number of shares reserved for issuance on the first day of each fiscal year equal to the least of (i) 8,768,800 shares, (ii) 4% of the Company’s common stock and non-voting common stock outstanding at December 31 of the immediately preceding year, or (iii) such number of shares as determined by the Company’s Board of Directors. As a result of this provision, on January 1, 2023 and 2022, an additional 1,723,292 and 1,299,920 shares, respectively, became available for issuance under the 2018 Plan. As of March 31, 2023, the 2018 Plan had 2,808,852 shares of common stock available for future issuance.

Total stock-based compensation expense related to the Company’s equity incentive plan and employee stock purchase plan was recorded in the statements of operations as follows (in thousands):


	Three Months Ended
	March 31,
	2023		2022
Research and development	$	6,439	$	6,607
General and administrative		4,608		4,892
Total stock-based compensation expense	$	11,047	$	11,499

The following table summarizes the Company's stock awards granted for each of the periods indicated:


	For the Three Months Ended March 31,
	2023				2022
	Grants		Weighted Average Grant Date Fair Value		Grants		Weighted Average Grant Date Fair Value
Stock options		251,100	$	16.84		1,859,642	$	12.85
Restricted stock units		19,214	$	20.06		374,755	$	16.06