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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2023
Stock-Based Compensation [Abstract]  
Share-based Compensation Expense The Company recorded share‑based compensation expense (for all awards and modifications, if any) in the accompanying consolidated statements of operations as follows (in thousands):

 
  
Year Ended December 31,
  
 
  
2023
    
2022
  
Selling and marketing
  
$
79
    
$
203
  
General and administrative
    
1,224
      
1,263
  
 
  
$
1,303
    
$
1,466
  
Stock Option Activity

The following table summarizes stock option activity for the years ended December 31, 2023 and 2022:

 
  
Number of
Shares Under
Option Plan
    
Weighted-
Average
Exercise Price
per Option
    
Weighted-
Average
Remaining
Contractual
Term (in
years)
  
Outstanding at January 1, 2022
    
3,938,613
    
$
1.90
        
Granted
    
1,000,000
      
1.41
        
Exercised
    
(15,000
)
    
1.29
        
Forfeited and expired
    
(448,899
)
    
2.63
        
Outstanding at December 31, 2022
    
4,474,714
    
$
1.72
      
8.02
  
Granted
    
4,545,069
      
0.63
          
Forfeited and expired
    
(1,291,062
)
    
1.56
          
Outstanding at December 31, 2023
    
7,728,721
    

1.11
      
6.70
  
Exercisable at December 31, 2023
    
1,256,062
    
$
1.75
      
2.09
  
Weighted Average Assumption Used for Grant Date Fair Value of Option Grants

For the years ended December 31, 2023 and 2022, the grant date fair value of all option grants was estimated at the time of grant using the Black-Scholes option-pricing model using the following weighted average assumptions:
 
 
  
Year Ended December 31,
  
 
  
2023
    
2022
  
Expected term (in years)
    
7.49
      
6.10
  
Expected volatility
    
74.58
%
    
89.57
%
Risk-free rate
    
4.38
%
    
2.51
%
Dividend rate
    
0.00
%
    
0.00
%
Summary of Activity in Restricted Stock Units

Restricted stock units have been issued to certain board members. Activity in restricted stock units is summarized in the following table:

 
  
Number of
Units
    
Weighted-
Average
Grant Date
Fair Value
 
Unvested at January  1, 2022
    
90,540
    
$
1.45
  
Granted
    
187,464
      
0.96
  
Vested
    
(158,407
)
    
1.26
  
Unvested at December 31, 2022
    
119,597
    
$
0.93
  
Granted
    
179,613
      
1.03
  
Vested
    
(179,467
)
    
0.96
  
Forfeited and expired
    
(97,089
)
    
1.03
  
Unvested at December 31, 2023
    
22,654
    
$
1.03