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Stock-Based Compensation, Stock Option Activity (Details) - Stock Options [Member] - USD ($)
$ / shares in Units, shares in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Number of Option Share [Roll Forward]      
Outstanding, beginning balance (in shares) 359 199  
Granted (in shares) 237 287  
Cancelled (in shares) (207) (127)  
Outstanding, ending balance (in shares) 389 359 199
Weighted Average Exercise Price per Share [Abstract]      
Outstanding, beginning balance (in dollars per share) $ 57 $ 168  
Granted (in dollars per share) 4 17  
Cancelled (in dollars per share) 19 141  
Outstanding, ending balance (in dollars per share) $ 45 $ 57 $ 168
Weighted Average Remaining Contractual Life [Abstract]      
Weighted-average remaining contractual life, outstanding 7 years 14 days 7 years 6 months 25 days 9 years 4 months 17 days
Aggregate Intrinsic Value [Abstract]      
Outstanding, beginning balance $ 0 $ 0  
Outstanding, ending balance $ 0 $ 0 $ 0
Options Vested and Exercisable [Abstract]      
Options vested and exercisable, outstanding (in shares) 331    
Options vested and exercisable, weighted average exercise price (in dollars per share) $ 50    
Options vested and exercisable, weighted average remaining contractual life 6 years 8 months 8 days    
Options vested and exercisable, aggregate intrinsic value $ 0