Annual report pursuant to Section 13 and 15(d)

Stockholders Equity (Stock-based Compensation Expense) (Details)

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Stockholders Equity (Stock-based Compensation Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Total stock-based compensation expense $ 568 $ 2,283
General and administrative    
Total stock-based compensation expense 436 700
Research and development    
Total stock-based compensation expense $ 132 $ 1,583