Stockholders' Equity (Tables)
|
12 Months Ended |
Dec. 31, 2021 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Schedule of Summarizes Stock Option Activities |
The following table summarizes stock option activities for the year ended December 31, 2021 and 2020:
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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 |
|
Exercise Price |
|
years) |
Outstanding at December 31, 2019 |
|
1,241,675 |
|
$ |
5.73 |
|
7.31 |
Options forfeited |
|
(100,000) |
|
|
5.73 |
|
— |
Outstanding at December 31, 2020 |
|
1,141,675 |
|
$ |
5.73 |
|
6.31 |
Outstanding at December 31, 2021 |
|
1,141,675 |
|
|
5.73 |
|
5.31 |
Options vested and exercisable at December 31, 2021 |
|
713,547 |
|
$ |
5.73 |
|
5.31 |
|
| Schedule of Stock-Based Compensation Expense |
The following table summarizes stock-based compensation expense for the years ended December 31, 2021 and 2020 (in thousands).
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For the year ended December 31, |
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2021 |
|
2020 |
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General and administrative |
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$ |
1,030 |
|
$ |
1,550 |
|
Research and development |
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|
2,278 |
|
|
1,437 |
|
Total stock-based compensation expense |
|
$ |
3,308 |
|
$ |
2,987 |
|
|
| Summary of Warrant Activities |
A summary of warrant activities for years ended December 31, 2021 and 2020, 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 |
|
Exercise Price |
|
years) |
Outstanding as of December 31, 2019 |
|
5,405,669 |
|
$ |
8.20 |
|
2.40 |
Cashless exercised |
|
(2,999) |
|
|
— |
|
— |
Outstanding as of December 31, 2020 |
|
5,402,670 |
|
$ |
8.21 |
|
1.39 |
Expired |
|
(2,093,878) |
|
|
8.50 |
|
— |
Cashless exercised |
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(138) |
|
|
— |
|
— |
Outstanding as of December 31, 2021 |
|
3,308,654 |
|
$ |
8.02 |
|
0.73 |
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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 |
Certain employees and directors have been awarded restricted stock. The restricted stock vesting consists of milestone and time-based vesting. The following table summarizes restricted stock award activities for the year ended December 31, 2021 and 2020:
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Weighted Average |
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|
|
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Grant Date Fair |
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|
Number of Shares |
|
Value |
Nonvested at December 31, 2019 |
|
299,060 |
|
$ |
5.66 |
Granted |
|
83,055 |
|
|
3.08 |
Vested |
|
(80,001) |
|
|
5.73 |
Nonvested at December 31, 2020 |
|
302,114 |
|
$ |
4.93 |
Granted |
|
68,870 |
|
|
3.63 |
Vested |
|
(90,001) |
|
|
6.69 |
Nonvested at December 31, 2021 |
|
280,983 |
|
$ |
4.05 |
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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 |
The following table summarizes restricted stock units’ activities for the year ended December 31, 2021 and 2020:
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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, 2019 |
|
1,112,417 |
|
$ |
5.11 |
Granted |
|
973,000 |
|
|
2.95 |
Forfeited |
|
(205,125) |
|
|
4.24 |
Vested |
|
(411,733) |
|
|
4.87 |
Nonvested at December 31, 2020 |
|
1,468,559 |
|
$ |
3.87 |
Granted |
|
1,660,250 |
|
|
3.07 |
Forfeited |
|
(372,873) |
|
|
3.60 |
Vested |
|
(420,379) |
|
|
4.27 |
Nonvested at December 31, 2021 |
|
2,335,557 |
|
$ |
3.27 |
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