Stockholders' Equity (Tables)
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9 Months Ended |
Sep. 30, 2022 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Summary of Stock Option Activities |
The following table summarizes stock option activities for the nine months ended September 30, 2022:
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Weighted Average |
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Remaining |
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Weighted Average |
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Contractual Life (in |
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|
Stock Options |
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Exercise Price |
|
years) |
Outstanding at December 31, 2021 |
|
1,141,675 |
|
$ |
5.73 |
|
5.31 |
Outstanding at September 30, 2022 |
|
1,141,675 |
|
|
5.73 |
|
4.56 |
Options vested and exercisable at September 30, 2022 |
|
713,547 |
|
$ |
5.73 |
|
4.56 |
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| Schedule of Stock-Based Compensation Expense |
The following table summarizes stock-based compensation expense for the three and nine months ended September 30, 2022 and 2021 (in thousands):
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For the three months ended September 30, |
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For the nine months ended September 30, |
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2022 |
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2021 |
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2022 |
|
2021 |
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General and administrative |
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$ |
194 |
|
$ |
229 |
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$ |
549 |
|
$ |
793 |
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Research and development |
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|
302 |
|
|
655 |
|
|
1,261 |
|
|
1,634 |
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Total stock-based compensation expense |
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$ |
496 |
|
$ |
884 |
|
$ |
1,810 |
|
$ |
2,427 |
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| Summary of Warrant Activities |
A summary of warrant activities for the nine months ended September 30, 2022, is presented below:
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Weighted Average |
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Remaining |
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|
Weighted Average |
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Contractual Life (in |
|
|
Warrants |
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Exercise Price |
|
years) |
Outstanding as of December 31, 2021 |
|
3,308,654 |
|
$ |
8.02 |
|
0.73 |
Expired |
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(3,003,770) |
|
|
8.50 |
|
— |
Granted |
|
748,036 |
|
|
0.80 |
|
9.43 |
Outstanding as of September 30, 2022 |
|
1,052,920 |
|
$ |
1.52 |
|
8.54 |
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| Restricted Stock Awards [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Schedules of Restricted Stock and Restricted Stock Unit Activity |
The following table summarizes restricted stock award activities for the nine months ended September 30, 2022:
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Weighted Average |
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Grant Date Fair |
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Number of Shares |
|
Value |
Nonvested at December 31, 2021 |
|
280,983 |
|
$ |
4.05 |
Granted |
|
358,320 |
|
|
0.70 |
Vested |
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(129,058) |
|
|
4.89 |
Nonvested at September 30, 2022 |
|
510,245 |
|
$ |
1.48 |
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| Restricted Stock Units [Member] |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| 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 nine months ended September 30, 2022:
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Weighted Average |
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Grant Date Fair |
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Number of Units |
|
Value |
Nonvested at December 31, 2021 |
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2,335,557 |
|
$ |
3.27 |
Granted |
|
1,249,397 |
|
|
0.82 |
Forfeited |
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(395,935) |
|
|
2.76 |
Vested |
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(720,019) |
|
|
2.93 |
Nonvested at September 30, 2022 |
|
2,469,000 |
|
$ |
2.02 |
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