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Common Stock (Tables) | 12 Months Ended
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Dec. 31, 2021
Equity [Abstract] |
Summary of Fair Value of Option Awards | The estimated fair value of stock options granted in the respective periods was determined using the Black-Scholes option pricing model using the following weighted average assumptions:
|  | 2021 |  |  | 2020 |  |
Risk-free interest rates |  |  | 0.66 | % |  |  | 0.94 | % |
Expected dividend yield |  |  | 0 | % |  |  | 0 | % |
Expected life |  | 6.00 years |  |  | 6.00 years |  |
Expected volatility |  |  | 110.10 | % |  |  | 108.78 | % |
Forfeiture rate |  |  | 0 | % |  |  | 0 | % |
Summary of Share-Based Compensation Expense | The results for the periods set forth below included stock-based compensation expense in the following expense categories of the consolidated statements of loss (in thousands):
|  | Year ended |
|  | December 31, |
|  | 2021 |  |  | 2020 |
Research and development |  | $ | 685 |  |  | $ | 403 |
General and administrative |  |  | 1,502 |  |  |  | 883 |
Total stock-based compensation |  | $ | 2,187 |  |  | $ | 1,286 |
Summary of Stock Options Activity | Stock option transactions and the number of stock options outstanding are summarized below:
|  | Number of |  |  | Weighted |
|  | Optioned |  |  | Average |
|  | Common |  |  | Exercise |
|  | Shares |  |  | Price |
Balance, January 1, 2021 |  |  | 227,442 |  |  | $ | 44.64 |
Granted |  |  | 294,650 |  |  |  | 12.07 |
Expired |  |  | (2 | ) |  |  | 39,204.00 |
Balance, December 31, 2021 |  |  | 522,090 |  |  | $ | 26.11 |
Summary of Stock Options Outstanding Regarding Number of Common Shares Issuable upon Exercise of Outstanding Options | (1) Number of common shares issuable upon exercise of outstanding options:
|  |  |  |  |  |  |  |  |  | Weighted- |
|  |  |  |  |  |  |  |  |  | Average |
|  |  |  |  |  |  |  |  |  | Remaining |
|  |  |  |  |  | Weighted- |  |  | Contractual |
|  |  |  |  |  | Average |  |  | Life |
Exercise Prices |  | Number of Options |  |  | Exercise Price |  |  | (in years) |
$7.20 - $9.25 |  |  | 50,500 |  |  | $ | 7.48 |  |  |  | 9.49 |
$9.26 - $10.13 |  |  | 11,250 |  |  |  | 9.90 |  |  |  | 9.36 |
$10.14 - $10.78 |  |  | 98,000 |  |  |  | 10.36 |  |  |  | 8.88 |
$10.79 - $11.65 |  |  | 74,880 |  |  |  | 11.20 |  |  |  | 8.08 |
$11.66 - $12.60 |  |  | 5,650 |  |  |  | 12.10 |  |  |  | 9.20 |
$12.61 - $20.74 |  |  | 232,750 |  |  |  | 13.09 |  |  |  | 9.07 |
$20.75 - $39.80 |  |  | 14,766 |  |  |  | 28.40 |  |  |  | 7.08 |
$39.81 - $59.30 |  |  | 18,747 |  |  |  | 51.20 |  |  |  | 6.72 |
$59.31 - $67.50 |  |  | 8,087 |  |  |  | 67.40 |  |  |  | 6.57 |
$67.51 - $28,952.00 |  |  | 7,460 |  |  |  | 837.69 |  |  |  | 6.00 |
|  |  | 522,090 |  |  | $ | 26.11 |  |  |  | 8.72 |
Summary of Stock Options Outstanding Regarding Number of Common Shares Issuable upon Exercise of Vested Options | (2) Number common shares issuable upon exercise of vested options:
|  |  |  |  |  |  |  |  |  | Weighted- |
|  |  |  |  |  |  |  |  |  | Average |
|  |  |  |  |  |  |  |  |  | Remaining |
|  |  |  |  |  | Weighted- |  |  | Contractual |
|  |  |  |  |  | Average |  |  | Life |
Exercise Prices |  | Number of Options |  |  | Exercise Price |  |  | (in years) |
$7.20 - $9.25 |  |  | 5,500 |  |  | $ | 8.60 |  |  |  | 8.36 |
$9.26 - $10.13 |  |  | — |  |  |  | — |  |  |  | — |
$10.14 - $10.78 |  |  | — |  |  |  | — |  |  |  | — |
$10.79 - $11.65 |  |  | 35,937 |  |  |  | 11.20 |  |  |  | 8.08 |
$11.66 - $12.60 |  |  | 1,413 |  |  |  | 12.10 |  |  |  | 9.20 |
$12.61 - $20.74 |  |  | — |  |  |  | — |  |  |  | — |
$20.75 - $39.80 |  |  | 11,862 |  |  |  | 28.40 |  |  |  | 7.08 |
$39.81 - $59.30 |  |  | 15,839 |  |  |  | 51.20 |  |  |  | 6.72 |
$59.31 - $67.50 |  |  | 6,939 |  |  |  | 67.40 |  |  |  | 6.57 |
$67.51 - $28,952.00 |  |  | 7,332 |  |  |  | 851.13 |  |  |  | 5.98 |
|  |  | 84,822 |  |  | $ | 98.12 |  |  |  | 7.42 |
Summary of Restricted Stock Unit Award Activity | The following table summarizes our restricted stock unit award activity during the year ended December 31, 2021:
|  |  |  |  |  | Weighted |
|  | Number |  |  | Average |
|  | of |  |  | Grant Date |
|  | Shares |  |  | Fair Value |
Balance, January 1, 2021 |  |  | 231 |  |  | $ | 580.00 |
Granted |  |  | 53,250 |  |  |  | 13.09 |
Released |  |  | (231 | ) |  |  | 580.00 |
Balance, December 31, 2021 |  |  | 53,250 |  |  | $ | 13.09 |
Summary of Outstanding Warrants | The following is a summary of outstanding warrants to purchase common stock at December 31, 2021:
|  | Total |  |  |  |  |  |  |
|  | Outstanding |  |  | Exercise |  |  |
|  | and |  |  | price per |  |  |
|  | Exercisable |  |  | Share |  |  | Expiration Date
(1) Warrants issued in September 2017 financing |  |  | 411 |  |  | $ | 699.2000 |  |  | March 2023
(2) Warrants issued in June 2018 financing |  |  | 114,100 |  |  | $ | 80.0000 |  |  | June 2023
(3) Warrants issued in October 2018 financing |  |  | 31,215 |  |  | $ | 62.8900 |  |  | October 2023
(4) Warrants issued in May 2019 financing |  |  | 60,000 |  |  | $ | 90.0000 |  |  | May 2025
(5) Warrants issued in December 2019 financing |  |  | 612,967 |  |  | $ | 6.6000 |  |  | December 2024
(6) Warrants issued in April 2020 financing |  |  | 182,461 |  |  | $ | 7.2400 |  |  | April 2025
(7) Warrants issued in April 2020 financing |  |  | 24,375 |  |  | $ | 7.3200 |  |  | April 2025
(8) Warrants issued in April 2020 financing |  |  | 25,270 |  |  | $ | 7.5900 |  |  | April 2025
(9) Pre-Funded Warrants issued in August 2020 financing |  |  | 142,857 |  |  | $ | 0.0010 |  |  | *
(10) Warrants issued in December 2020 financing |  |  | 50,000 |  |  | $ | 8.7500 |  |  | December 2025
Computation of Basic and Diluted Net Loss Attributable to Common Shareholders Per Share | The following table presents the computation of basic and diluted net loss attributable to common stockholders per share (in thousands, except per share and share amounts):
|  | Years ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Numerator |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ | (33,152 | ) |  | $ | (14,730 | ) |  | $ | (16,395 | )
Denominator |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding |  |  | 8,119,836 |  |  |  | 2,718,909 |  |  |  | 412,320 |
Basic and diluted net loss per common share |  | $ | (4.08 | ) |  | $ | (5.42 | ) |  | $ | (39.76 | )

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