Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of the Company's Stock Option Plan Activity

Following is a summary of the Company’s stock option plan activity and related information for the year ended December 31, 2021:

 

 

 

Shares

 

 

Weighted

Average

Exercise

Price

 

 

Weighted

Average

Remaining

Contractual

Term

(Years)

 

 

Intrinsic

Value

(thousands)

 

Balance at January 1, 2021

 

 

4,738,607

 

 

$

10.34

 

 

 

8.34

 

 

 

 

 

Granted

 

 

7,228,445

 

 

 

8.81

 

 

 

 

 

 

 

 

 

Exercised

 

 

(583,332

)

 

 

3.39

 

 

 

 

 

 

 

 

 

Forfeited/Cancelled

 

 

(1,484,013

)

 

 

10.83

 

 

 

 

 

 

 

 

 

Balance at December 31, 2021

 

 

9,899,707

 

 

$

9.57

 

 

 

8.57

 

 

$

2,938

 

Options vested and expected to vest as of December 31, 2021

 

 

9,899,707

 

 

$

9.57

 

 

 

8.57

 

 

$

2,938

 

Options vested and exercisable as of December 31, 2021

 

 

3,033,767

 

 

$

9.81

 

 

 

7.43

 

 

$

2,792

 

Schedule of Assumptions Used to Determine the Fair Value of Options Granted

The assumptions that the Company used to determine the fair value of options granted to employees, non-employees and directors were as follows:

 

 

 

Year Ended December 31,

 

 

 

2021

 

 

2020

 

Risk-free interest rate

 

0.5%–1.3%

 

 

0.4%–1.4%

 

Expected volatility

 

82.2–84.3%

 

 

79–86%

 

Expected term (years)

 

5.5–6.0

 

 

5.5–6.0

 

Dividend yield

 

 

 

 

 

 

Schedule of Stock-Based Compensation Expense

The Company recorded total stock-based compensation expense in the following expense categories of the accompanying consolidated statements of operations and comprehensive loss (in thousands):

 

 

 

Year Ended December 31,

 

 

 

2021

 

 

2020

 

Research and development

 

$

8,090

 

 

$

3,872

 

General and administrative

 

 

8,614

 

 

 

3,348

 

Total stock-based compensation expense

 

$

16,704

 

 

$

7,220