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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2022
Stock-Based Compensation  
Summary of common stock reserved for future issuance

    

Shares

Reserved

Common stock options outstanding

 

4,262,702

Unvested restricted stock units

279,500

Available for future grants under the 2021 Equity Incentive Plan

 

2,165,387

Available for future grants under the 2021 Employee Stock Purchase Plan

479,012

Available for future grants outside of the 2021 Plan as inducement award

100,000

Total shares of common stock reserved

 

7,286,601

Summary of the Company's stock option activity

Options
Outstanding

Weighted-
Average Exercise
Price

Weighted-Average
Remaining
Contractual Term

 

Aggregate
Intrinsic Value

Outstanding at December 31, 2021

4,215,643

$

5.49

8.5

Granted

233,600

$

6.80

Exercised

(713)

$

3.45

Forfeited/Expired

 

(185,828)

 

$

6.48

 

  

Outstanding at March 31, 2022

 

4,262,702

 

$

5.52

 

8.0

$

379

Vested at March 31, 2022

 

1,490,020

 

$

4.20

 

6.4

$

368

Exercisable at March 31, 2022

 

2,703,228

 

$

4.49

 

7.2

$

375

Summary of weighted-average assumptions to determine the fair value of the employee stock option

    

 

Three Months Ended March 31, 

 

    

2022

    

2021

 

Risk-free interest rate

 

1.8

%  

0.7

%

Expected volatility

 

85.2

%  

71.2

%

Expected term (in years)

 

6.0

 

5.9

Expected dividend yield

 

%  

%

Summary of PSU activity

Weighted-

Number of

Average Grant Date

PSUs

Fair Value

Outstanding at December 31, 2021

299,500

$

6.32

Granted

10,000

8.98

Released

Cancelled

(30,000)

6.69

Outstanding at March 31, 2022

279,500

$

6.37

Summary of Non-cash stock-based compensation expense recorded

The following table summarizes stock compensation expense, including expense associated with award modifications for unvested options, reflected in the unaudited consolidated statements of operations and comprehensive loss (in thousands):

Three Months Ended March 31, 

2022

    

2021

Research and development

$

387

$

364

General and administrative

720

107

Total

$

1,107

$

471