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Share-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Schedule of Outstanding Stock Options

Total outstanding stock options as of March 31, 2021 and 2020 were as follows:

 

 

 

2021

 

 

2020

 

 

 

Number of

shares

 

 

Weighted

average

exercise price

 

 

Number of

shares

 

 

Weighted

average

exercise price

 

Outstanding at beginning of period

 

 

4,132,123

 

 

$

6.39

 

 

 

3,505,119

 

 

$

2.07

 

Granted

 

 

1,141,726

 

 

$

36.50

 

 

 

 

 

$

 

Exercised

 

 

(87,786

)

 

$

2.09

 

 

 

(181,318

)

 

$

1.79

 

Cancelled or forfeited

 

 

(10,828

)

 

$

8.78

 

 

 

 

 

$

 

Outstanding at end of period

 

 

5,175,235

 

 

$

13.10

 

 

 

3,323,801

 

 

$

2.09

 

Schedule of Share-based Compensation Expense

Share-based compensation expense was allocated as follows:

 

 

 

Three Months Ended March 31,

 

 

 

2021

 

 

2020

 

 

 

(in thousands)

 

Research and development

 

$

987

 

 

$

133

 

General and administrative

 

 

1,070

 

 

 

138

 

Total share-based compensation expense

 

$

2,057

 

 

$

271

 

Schedule of Fair Value of Stock Options Determined on Grant Date Using Black Scholes Option-Pricing Model

 

The grant date fair value of stock options granted during the three-months ended March 31, 2021 was $23.83 per option. The assumptions that the Company used in the Black Scholes option-pricing model to determine the grant date fair value of stock options granted to employees and non-employees were as follows, presented on a weighted average basis:

 

 

 

Three Months Ended March 31,

 

 

 

2021

 

 

2020

 

Risk-free interest rate

 

 

0.67

%

 

 

 

Expected terms (in years)

 

 

6.08

 

 

 

 

Expected volatility

 

 

75.41

%

 

 

 

Expected dividend yield

 

 

0.00

%