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Equity
 3 Months Ended
Mar. 31, 2022
Equity [Abstract]  
Equity
Note 6 — Equity
Common Stock
We issued no shares for options exercised during the three months ended March 31, 2022 or 2021, respectively. We issued no shares as a result of vesting RSUs during the three months ended March 31, 2022 or 2021, respectively.

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, 2021
    
Issued
    
Exercised
    
Terminated /
Cancelled
    
Outstanding and
Exercisable
March 31, 2022
  
Expiration Date
 
25,000
    
$
5.75
      
25,000
      
—
      
—
      
—
      
25,000
  
April 30, 2025