Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Tables)

v3.20.4
Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2020
Stockholders' Equity  
Summary of restricted stock award activity

Certain employees, directors and consultants have been awarded restricted stock. The restricted stock vesting consists of milestone and time-based vesting. The following table summarizes restricted stock award activity for the year ended December 31, 2020 and 2019:

Weighted Average

Grant Date Fair

    

Number of Shares

    

Value

Nonvested at December 31, 2018

 

2,932,106

$

4.22

Granted

 

800,652

 

3.33

Forfeited

 

(21,000)

 

3.16

Vested

 

(407,919)

1.96

Nonvested at December 31, 2019

 

3,303,839

$

4.29

Granted

1,117,340

2.39

Vested

 

(551,283)

 

5.23

Non-vested at December 31, 2020

 

3,869,896

$

3.61

Summary of stock option award activity

The following table summarizes stock option award activity for the year ended December 31, 2020 and 2019:

Weighted Average

Remaining

Weighted Average

Contractual Life

    

Stock Options

    

Exercise Price

    

(in years)

Outstanding as of December 31, 2018

 

60,000

$

5.43

 

8.09

Granted

 

100,000

 

2.56

 

Outstanding as of December 31, 2019

 

160,000

$

3.64

 

8.56

Granted

 

60,000

 

2.04

 

Outstanding as of December 31, 2020

220,000

$

3.20

8.04

Vested and exercisable as of December 31, 2020

 

25,000

$

1.87

 

8.82

Summary of stock options granted

The Company used the Black-Scholes option pricing model for determining the estimated fair value of stock-based compensation related to stock options. The table below summarizes the assumptions used:

For the Years Ended December 31,

 

    

2020

    

2019

 

Risk-free interest rate

 

0.65% - 1.02%

1.77% - 2.72%

Expected dividend yield

 

Expected term in years

 

10.0

10.0

Expected volatility

 

101.27% - 104.60%

99.84% - 103.79%

Summary of warrant activities

A summary of warrant activities for year ended December 31, 2020 and 2019 is presented below:

Weighted Average

Remaining

Weighted Average

Contractual Life

    

Warrants

    

Exercise Price

    

(in years)

Outstanding as of December 31, 2018

 

4,280,972

$

6.69

 

2.33

Exercised

 

(73,525)

 

 

  

Outstanding as of December 31, 2019

 

4,207,447

$

6.81

 

1.25

Exercised

 

(102,742)

 

0.13

 

Expired

 

(4,047,190)

 

7.00

 

Outstanding as of December 31, 2020

 

57,515

$

5.39

 

1.22

Summary of stock-based compensation expense

The following table summarizes stock-based compensation expense for the years ended December 31, 2020 and 2019 (in thousands).

For the year ended December 31, 

2020

    

2019

Research and development

$

617

$

707

General and administrative

 

2,163

 

2,414

Total stock-based compensation expense

$

2,780

$

3,121