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Equity | 6 Months Ended
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Jun. 30, 2023
Equity [Abstract] |
Equity | Note 6 — Equity Common Stock We issued no shares for options exercised during the three and six months ended June 30, 2023 or 2022, respectively. We issued 215,255 and 191,795 shares as a result of vesting RSUs during the three months ended June 30, 2023 and 2022, respectively. No shares were issued during the first three months of 2023 or 2022 as a result of vesting RSUs. Warrants In 2020, we issued warrants for the purchase of 25,000 shares of common stock at an exercise price of $5.75 per share, exercisable on the date of grant, expiring in April 2025. The weighted average fair value at the grant date was $4.16 per warrant. The fair value at the grant date was estimated utilizing the Black-Scholes valuation model with the following weighted average assumptions (i) dividend yield on our common stock of 0 percent (ii) expected stock price volatility of 97 percent (iii) a risk-free interest rate of 0.27 percent and (iv) and expected option term of 5 years.
Warrants Issued |  |  | Exercise Price |  |  | Outstanding and Exercisable December 31, 2022 |  |  | Issued |  |  | Exercised |  |  | Terminated / Cancelled |  |  | Outstanding and Exercisable June 30, 2023 |  | Expiration Date
| 25,000 |  |  | $ | 5.75 |  |  |  | 25,000 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 25,000 |  | April 30, 2025

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