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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Summary of Stock Option Award Activity

The following is a summary of the stock option award activity during the three months ended March 31, 2023:

 

 

 

Number
of Stock
Options

 

 

Weighted-
Average
Exercise
Price

 

 

Weighted-
Average
Remaining
Contractual
Term
(in years)

 

 

Aggregate
Intrinsic
Value
(in thousands)

 

Outstanding at December 31, 2022

 

 

3,333,434

 

 

$

8.80

 

 

 

8.09

 

 

$

1

 

Granted

 

 

503,971

 

 

$

1.43

 

 

 

 

 

 

 

Forfeited

 

 

(29,723

)

 

$

8.74

 

 

 

 

 

 

 

Expired

 

 

(64,980

)

 

$

9.84

 

 

 

 

 

 

 

Outstanding at March 31, 2023

 

 

3,742,702

 

 

$

7.79

 

 

 

8.22

 

 

$

39

 

       Options expected to vest as of March 31, 2023

 

 

1,944,833

 

 

$

4.79

 

 

 

8.78

 

 

$

39

 

Exercisable at March 31, 2023

 

 

1,797,869

 

 

$

11.03

 

 

 

7.61

 

 

$

 

Summary of Restricted Stock Unit Activity

The following is a summary of the restricted stock unit activity during the three months ended March 31, 2023:

 

 

Restricted Stock Units

 

 

Weighted-
Average
Grant Date Fair Value

 

Unvested at December 31, 2022

 

 

215,854

 

 

$

3.69

 

   Granted

 

 

325,369

 

 

$

1.47

 

   Vested

 

 

(267,024

)

 

$

1.99

 

   Forfeited

 

 

(4,037

)

 

$

3.04

 

Unvested at March 31, 2023

 

 

270,162

 

 

$

2.71

 

Summary of Common Stock Warrant Activity

The following is a summary of the employee-issued common stock warrant activity during the three months ended March 31, 2023:

 

 

Number
of Common
Stock
Warrants

 

 

Weighted-
Average
Exercise
Price

 

 

Weighted-
Average
Remaining
Contractual
Term
(in years)

 

 

Aggregate
Intrinsic
Value (in
thousands)

 

Outstanding and exercisable at December 31, 2022

 

 

57,004

 

 

$

6.94

 

 

 

1.91

 

 

$

 

   Granted

 

 

 

 

 

 

 

 

 

 

 

 

   Exercised

 

 

 

 

 

 

 

 

 

 

 

 

   Expired

 

 

(312

)

 

 

144

 

 

 

 

 

 

 

Outstanding and exercisable at March 31, 2023

 

 

56,692

 

 

$

6.19

 

 

 

1.91

 

 

$

 

Summary of Fair Value Assumptions and Methodology The following table presents the assumptions and the Company’s methodology for developing each of the assumptions used:

 

 

 

Three Months Ended March 31,

 

 

2023

 

2022

Volatility

 

93%

 

94%-96%

Expected term (years)

 

6.0-7.0

 

5.8-7

Risk-free interest rate

 

3.6%–4.0%

 

1.7%-2.4%

Dividend rate

 

—%

 

—%

Summary of Stock-Based Compensation Expense

Stock-based compensation expense was recorded in the following line items in the condensed consolidated statements of operations for the three months ended March 31, 2023 and 2022 (in thousands):

 

 

 

Three Months Ended March 31,

 

 

 

2023

 

 

2022

 

Research and development

 

$

292

 

 

$

555

 

General and administrative

 

 

921

 

 

 

960

 

Total stock-based compensation expense

 

$

1,213

 

 

$

1,515