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Long-term Prepaid Expenses and Other Assets
 12 Months Ended
Dec. 31, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Long-term Prepaid Expenses and Other Assets Long-term Prepaid Expenses and Other Assets
Long-term prepaid expenses and other assets consisted of the following (in thousands):
December 31,
20242023
Prepaid research and development - long-term
5,737 5,955 
Investment
469 469 
Property and equipment189 423 
Other assets
200 202 
$6,595 $7,049