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Research and Development Agreement
 12 Months Ended
Dec. 31, 2023
Research and Development [Abstract]  
Research and Development Agreement

(9) Research and Development Agreement

In December 2018, the Company entered into an agreement with the Belgium Walloon Region Government ("Walloon Region") in which the Walloon Region agreed to provide a grant of €1.3 million and a repayable advance of €8.3 million for the development of one of the Company’s research programs. During 2020, the Company discontinued research efforts related to this program.

Other current liabilities of $2.3 million and $2.2 million as of December 31, 2023 and December 31, 2022, respectively, represent the remaining amount of the advance received.

In 2022, the Company received notice that the Walloon Region had obtained a default judgment seeking repayment of approximately $2.3 million of the advance based upon the Company allegedly not providing required notification that research and operations in the region were discontinued. In the year ended December 31, 2022, the Company reduced the recorded liability from the prior total of all amounts received under the advance from the Walloon Region, to the $2.3 million repayment that would be due based on the default judgment, and recorded a gain of approximately $2.7 million in “other income (expense), net” on its consolidated statement of operations.