The Company’s Amended and Restated 2020 Equity Incentive Plan, or the 2020 Plan, serves as the successor to the Company’s 2020 Equity Incentive Plan and provides for the granting of incentive stock options, non-statutory stock options, stock appreciation rights, restricted stock, restricted stock units, performance units and performance shares.

On January 1, 2024, the number of shares available under the 2020 Plan was increased by 1,998,080 shares.

In February 2024, the Company granted 365,000 performance-based restricted stock units, or PSUs, to certain employees under the 2020 Plan. The PSUs are subject to both performance-based and service-based vesting conditions with a fair value based on the closing price of the underlying common stock on the date of grant. Each PSU is split into two tranches with each tranche having performance goals based on the achievement of pre-determined clinical milestones that result in the shares attributable to such tranche being eligible for vesting, subject to the service-based vesting condition. The service-based vesting condition is satisfied on the one-year anniversary of the performance achievement date for each tranche and is subject to the employee’s continuous service through such vesting date. Upon vesting, each PSU will automatically convert into one share of the Company’s common stock. If the performance condition for a tranche is not met by March 31, 2025, the shares attributable to such tranche will be forfeited.

Compensation expense for awards with performance-based vesting requirements are recognized on a tranche-by-tranche basis based on the grant date fair value over the requisite service period using the accelerated attribution method if and when the performance condition is deemed to be probable of being achieved. At each reporting period, the Company will assess the probability of the performance condition being met for each tranche and, as applicable, recognize the cumulative effect of the change in estimate in the period of the change.

As of September 30, 2024, the Company determined that the achievement of the performance conditions for each tranche of PSUs was not probable. As a result, no compensation expense has been recognized for these awards as of and for the three months and nine months ended September 30, 2024.

Under the Company’s 2020 Employee Stock Purchase Plan, or the ESPP, eligible employees are entitled to purchase shares of common stock with accumulated payroll deductions.

Total stock-based compensation expense recognized in the condensed consolidated statements of operations was as follows (in thousands):


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2024		2023		2024		2023
Research and development	$	4,648	$	3,728	$	14,556	$	10,011
General and administrative		2,304		3,236		6,679		9,541
Total	$	6,952	$	6,964	$	21,235	$	19,552