Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2022

Stock-Based Compensation [Abstract]

Summary of Stock Option Activity

Number of Stock

Options

Outstanding

Weighted Price

Per Share

Weighted

Contractual

Term (years)

Aggregate

Intrinsic Value

(in thousands)

Balance at December 31, 2021

21,387,909

$

5.25

7.4

$

49,684

Granted

303,086

5.36

Exercised

(842,938)

(3.89)

Forfeited

(573,980)

(5.16)

Balance at March 31, 2022

20,274,077

$

5.31

7.5

$

32,167

Options vested and exercisable at March 31, 2022

13,363,870

$

4.46

7.1

$

27,022

Summary of Restricted Stock Activity

Number of

Shares

Weighted

Average

Grant Date

Fair Value

Per Share

Unvested at December 31, 2021

—

$

—

Issued

300,000

3.76

Unvested at March 31, 2022

300,000

$

3.76

Schedule of Stock-Based Compensation Expense for Stock Options

Three Months Ended March 31,

2022

2021

General and administrative

$

1,371

$

3,167

Research and development

807

273

Total stock-based compensation expense

$

2,178

$

3,440