Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Tables)

v3.24.2.u1
Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]  
Summary of Stock Option Activities

The following table summarizes stock option activities for the six months ended June 30, 2024:

​

​

​

​

​

​

​

​

​

​

    

​

    

​

​

    

Weighted Average

​

​

​

​

​

​

​

Remaining

​

​

​

​

Weighted Average

​

Contractual Life (in

​

​

Stock Options

​

Exercise Price

​

years)

Outstanding at December 31, 2023

 

76,112

​

$

85.95

 

3.31

Outstanding at June 30, 2024

 

76,112

​

$

85.95

 

2.81

Options vested and exercisable at June 30, 2024

 

47,570

​

$

85.95

 

2.81

Schedule of Stock-Based Compensation Expense

The following table summarizes stock-based compensation expense for the three and six months ended June 30, 2024 and 2023 (in thousands):

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

For the three months ended June 30, 

​

For the six months ended June 30, 

​

​

    

2024

    

2023

    

2024

    

2023

    

General and administrative

​

$

51

​

$

153

​

$

98

​

$

262

​

Research and development

​

 

(670)

​

 

(108)

​

 

(640)

​

 

18

​

Total stock-based compensation expense

​

$

(619)

​

$

45

​

$

(542)

​

$

280

​

​

Summary of Warrant Activities

A summary of warrant activities for the six months ended June 30, 2024, is presented below:

​

​

​

​

​

​

​

​

​

​

    

​

    

​

​

    

Weighted Average

​

​

​

​

​

​

​

Remaining

​

​

​

​

Weighted Average

​

Contractual Life (in

​

​

Warrants

​

Exercise Price

​

years)

Outstanding as of December 31, 2023

 

4,481,868

​

$

1.34

 

5.34

Exercised

 

(20,490,874)

​

 

—

 

—

Granted

 

76,966,010

​

 

0.19

 

2.74

Outstanding as of June 30, 2024

 

60,957,004

​

$

0.29

 

2.98

Restricted stock award  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]  
Schedules of Restricted Stock and Restricted Stock Unit Activity

The following table summarizes restricted stock award activities for the six months ended June 30, 2024:

​

​

​

​

​

​

​

​

    

​

    

Weighted Average

​

​

​

​

Grant Date Fair

​

​

Number of Shares

​

Value

Nonvested at December 31, 2023

 

64,706

​

$

11.59

Vested

​

(4,595)

​

​

54.45

Nonvested at June 30, 2024

 

60,111

​

$

8.32

Restricted stock units  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]  
Schedules of Restricted Stock and Restricted Stock Unit Activity

Certain employees and consultants have been awarded restricted stock units with time-based vesting. The following table summarizes restricted stock units’ activities for the six months ended June 30, 2024:

​

​

​

​

​

​

​

​

    

​

    

Weighted Average

​

​

​

​

Grant Date Fair

​

​

Number of Units

​

Value

Nonvested at December 31, 2023

 

95,197

​

$

18.78

Forfeited

​

(63,782)

​

​

18.19

Vested

 

(17,199)

​

 

22.41

Nonvested at June 30, 2024

 

14,216

​

$

17.02