XML 48 R27.htm IDEA: XBRL DOCUMENT v3.22.1
Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2021
Schedule of weighted-average assumptions estimated at the date of grant using the Black-Scholes option pricing model

    

2021

    

    

2020

    

Expected stock price volatility

 

115

-

124

%  

 

116

-

122

%  

Expected term of options

 

5.0

-

6.1

years

 

5.3

-

6.1

years

Risk‑free interest rate

 

0.44

-

1.33

%  

 

0.31

-

1.73

%  

Expected annual dividend yield

 

0

%  

 

0

%  

Schedule of unrecognized compensation expense expected to be recognized in future years

2022

    

$

9,716

2023

 

7,315

2024

 

3,186

2025

 

768

$

20,985

Stock option  
Schedule of total compensation cost recognized in the statement of operations

Total compensation cost recognized for all stock option awards in the statements of operations is as follows (in thousands):

Year Ended December 31,

2021

2020

Research and development

    

$

4,482

    

$

2,938

    

General and administrative

 

9,106

 

4,521

Total

$

13,588

$

7,459

Summary of activity for all options

    

    

Weighted

    

 

Average

Aggregate

 

Exercise Price

Intrinsic

 

Shares

Per Share

Value

 

Outstanding—December 31, 2019

 

2,135,070

$

15.80

Granted

 

1,905,850

 

9.17

Exercised

(198,475)

 

5.16

Forfeited

(180,107)

11.04

Expired

(154,700)

25.16

Outstanding—December 31, 2020

 

3,507,638

$

12.64

Granted

 

1,868,066

 

13.49

Exercised

 

(176,194)

 

6.80

Forfeited

(225,726)

11.85

Expired

(234,929)

32.81

Outstanding—December 31, 2021

 

4,738,855

$

12.23

$

9,531

Exercisable—December 31, 2021

 

2,450,061

$

12.56

$

6,521

Restricted stock  
Schedule of total compensation cost recognized in the statement of operations

Total compensation cost recognized for all restricted stock awards in the statements of operations for the years ended December 31, 2021 and 2020 is as follows (in thousands):

Year Ended

December 31,

2021

2020

Research and development

    

$

3

    

$

General and administrative

 

276

 

183

Total

$

279

$

183

Summary of activity for all restricted stock

A summary of activity for the years ended December 31, 2021 and 2020 is presented below:

    

    

Weightedaverage

Grant Date

Shares

Fair Value per Share

Outstanding—December 31, 2019

 

8,100

$

4.84

Granted

 

34,000

12.93

Vested

 

(17,475)

10.04

Outstanding—December 31, 2020

24,625

11.41

Granted

18,400

13.48

Vested

(17,000)

12.93

Outstanding—December 31, 2021

 

26,025

$

12.75

Expected to vest—December 31, 2021

 

26,025

$

12.75