Quarterly report pursuant to Section 13 or 15(d)

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

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Stockholders Equity (Stock-based Compensation Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Total stock-based compensation expense $ 100 $ 496 $ 380 $ 1,810
General and administrative        
Total stock-based compensation expense 119 194 381 549
Research and development        
Total stock-based compensation expense $ (19) $ 302 $ (1) $ 1,261