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Stockholders’ Equity | 6 Months Ended
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Jun. 30, 2023
Equity [Abstract] |
Stockholders’ Equity | 12. Stockholders’ Equity Common Stock As of June 30, 2023, 4,073,757 shares of common stock were issued and outstanding, 255,958 shares of common stock were reserved for issuance upon the exercise of outstanding warrants, and 497,330 shares of common stock were reserved for issuance under our 2015 Equity Incentive Plan, as amended (the “2015 Plan”). The following table describes the shares and warrants issued as part of our 2022 and 2020 private placements: Schedule of Shares and Warrants Issued
Issuance of Common Stock |  | Issue Date |  | Shares Issued |  |  | Price per share |  |  | Warrants Issued |  |  | Warrant Exercise Price |  |  | Warrant Fair Value |
Private Placement 2022 |  | April 1, 2022 |  |  | 1,242,588 |  |  | $ | 4.62 |  |  |  | 124,258 |  |  | $ | 4.62 |  |  | $ | 3.91 |
Private Placement 2020 |  | March 2, 2020 |  |  | 955,000 |  |  | $ | 4.00 |  |  |  | 95,500 |  |  | $ | 4.00 |  |  | $ | 3.90 |
Amortization of the debt issuance costs for the Private Placement 2020 offering was recorded at $6,224 and $17,290 for the three and six months ended June 30, 2023, and at $25,935 and $51,869 for the three and six months ended June 30, 2022. Warrants The following sets forth the warrants to purchase our common stock that were outstanding as of June 30, 2023: Schedule of Warrants to Purchase Common Stock
Warrants Outstanding |  |  | Warrant Exercise Price |  |  | Warranty Expiry
| 124,258 |  |  | $ | 4.62 |  |  | March 30, 2027
| 95,500 |  |  | $ | 4.00 |  |  | March 30, 2027
| 16,000 |  |  | $ | 9.00 |  |  | March 30, 2027
| 17,200 |  |  | $ | 12.50 |  |  | March 30, 2027
| 3,000 |  |  | $ | 15.00 |  |  | March 30, 2027
The estimated value of the warrants issued during the six months ended June 30, 2022, as well as the assumptions that were used in calculating such values, were based on estimates at the issuance date in the table below. Schedule of Estimated Values of Warrants Valuation Assumptions
|  | Warrants Issued |
|  | April 1, 2022 |
Risk-free interest rate |  |  | 2.55 | %
Weighted average expected term |  |  | 5 years |
Expected volatility |  |  | 116.32 | %
Expected dividend yield |  |  | 0.00 | %

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