Equity incentive plans (Table)
 12 Months Ended
Dec. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Schedule of stock options granted to employees and non-employees

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

 

 

 

Year Ended December 31,

 

 

 

2021

 

 

2020

 

Risk-free interest rate

 

0.6% - 1.4%

 

 

0.4% - 0.7%

 

Expected term

 

5.3 - 6.1 years

 

 

5.5 - 6.1 years

 

Expected volatility

 

 

79

%

 

 

79

%

Expected dividend yield

 

 

—

%

 

 

—

%
Schedule of Stock Option Activity The following table summarizes option activity since December 31, 2020:

 

 

 

Number of
stock options

 

 

Weighted
average
exercise price
per share

 

 

Weighted
average
remaining
contractual
term

 

 

Aggregate
intrinsic value

 

 

 

 

 

 

 

 

 

(in years)

 

 

(in thousands)

 

Outstanding at December 31, 2020

 

 

2,316,899

 

 

$

4.00

 

 

 

 

 

 

 

Granted

 

 

5,057,146

 

 

$

11.99

 

 

 

 

 

 

 

Exercised

 

 

(208,890

)

 

$

1.48

 

 

 

 

 

 

 

Forfeited and expired

 

 

(2,095,996

)

 

$

10.20

 

 

 

 

 

 

 

Outstanding at December 31, 2021

 

 

5,069,159

 

 

$

9.52

 

 

 

8.9

 

 

$

734

 

Options vested and expected to vest at December 31, 2021

 

 

5,069,159

 

 

$

9.52

 

 

 

8.9

 

 

$

734

 

Options vested and exercisable at December 31, 2021

 

 

750,918

 

 

$

3.88

 

 

 

7.7

 

 

$

468

 
Schedule of Restricted Stock Unit Activity

The following table summarizes the Company’s restricted stock activity since December 31, 2020:

 

 

 

Number of
shares

 

 

Weighted
average grant
date fair value

 

Unvested at December 31, 2020

 

 

35,568

 

 

$

1.00

 

Granted

 

 

1,333,762

 

 

$

3.56

 

Forfeited

 

 

(85,680

)

 

$

3.55

 

Vested

 

 

(35,568

)

 

$

1.00

 

Unvested at December 31, 2021

 

 

1,248,082

 

 

$

3.56

 
Summary of Stock-based Compensation Expense

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

 

 

 

Year Ended December 31,

 

 

 

2021

 

 

2020

 

Research and development

 

$

2,575

 

 

$

306

 

General and administrative

 

 

5,212

 

 

 

677

 

Total stock-based compensation expense

 

$

7,787

 

 

$

983