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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2024
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,
  
 
  
2024
    
2023
  
Selling and marketing
  
$
7
    
$
79
  
General and administrative
    
420
      
1,224
  
 
  
$
427
    
$
1,303
  
Stock Option Activity

The following table summarizes stock option activity for the years ended December 31, 2024 and 2023:

 
  
Number of Shares
 Under Option Plan
    
Weighted- Average
Exercise Price per
 Option
  
Weighted- Average
Remaining
Contractual Term
 (in years)
  
Outstanding at January 1, 2023
    
447,462
    
$
17.20
      
Granted
    
454,504
    
$
6.31
      
Forfeited and expired
    
(129,102
)
  
$
15.59
      
Outstanding at December 31, 2023
    
772,864
    
$
11.07
      
6.70
  
Granted
    
70,000
    
$
3.22
          
Forfeited and expired
    
(321,138
)
  
$
14.07
          
Outstanding at December 31, 2024
    
521,726
    
$
8.16
      
7.88
  
Exercisable at December 31, 2024
    
208,671
    
$
12.21
      
6.32
  
Vested and expected to vest at December 31, 2024     521,726     $ 8.16       7.88  
Weighted Average Assumption Used for Grant Date Fair Value of Option Grants

For the years ended December 31, 2024 and 2023, 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,
  
 
  
2024
    
2023
  
Expected term (in years)
    
6.46
      
7.49
  
Expected volatility
    
77.93
%
    
74.58
%
Risk-free rate
    
3.91
%
    
4.38
%
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, 2023
    
11,960
    
$
11.25
  
Granted
    
17,959
    
$
10.30
  
Vested
    
(17,944
)
  
$
10.93
  
Forfeited and expired     (9,710 )   $ 10.30  
Unvested at December 31, 2023
    
2,265
    
$
10.30
  
Vested
    
(2,265
)
  
$
10.30
  
Unvested at December 31, 2024
    
—
    
$
—