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Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2023
Stock-based Compensation [Abstract]  
Stock Option Activity
The following table summarizes stock option activity for the six months ended June 30, 2023:
   
Number of
Shares
    
Weighted Average
Exercise Price
per Share
    
Weighted Average
Remaining
Contractual Term
(in years)
 
Outstanding at January 1, 2023
    
4,474,714
    
$
1.72
        
Granted
    
905,000
    
$
1.06
        
Exercised
    
—
 
$
—
        
Forfeited and expired
    
(10,000
)
  
$
1.45
        
Outstanding at June 30, 2023     5,369,714     $ 1.61       7.9  
Exercisable at June 30, 2023     2,787,390     $ 1.81       7.1  
Vested and expected to vest
     5,369,714     $ 1.61       7.9  
Weighted Average Assumption Used for Grant Date Fair Value of Option Grants
For the six months ended June 30, 2023, the fair value of each option was estimated on the date of grant using the weighted average assumptions in the table below:

Expected volatility
    
71.4
%
Risk‑free interest rate
    
3.6
%
Expected term (in years)
    
6.2
  
Expected dividend yield
    
0.0
%
Summary of Restricted Stock Unit Unvested
Restricted stock units have been issued to certain board members. Restricted stock units unvested are summarized in the following table:

   
Number of
Shares
    
Weighted Average
Grant Date
Fair Value
  
Unvested at January 1, 2023
    
119,597
    
$
0.93
  
Granted
    
—
    
$
—
  
Vested
    
(79,730
)
  
$
0.93
  
Unvested at June 30, 2023     39,867     $ 0.93