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Revenue Interest Financing Agreement - Terms (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Oct. 28, 2022
Mar. 31, 2024
Jun. 30, 2024
Revenue Interest Financing Agreement      
Estimated effective annual interest rate, percentage     17.00%
Total issuance costs   $ 2.6 $ 0.1
Each calendar quarter from and after the Closing Date through and including the quarter ended June 30, 2026 | Sagard      
Revenue Interest Financing Agreement      
Quarterly payments expressed as a percentage of the U.S. net sales of Ztalmy and all other pharmaceutical products that contain ganaxolene, required under the revenue interest financing agreement. 7.50%    
Revenue Interest Financing Agreement | Oaktree Capital Management LP Credit Agreement      
Revenue Interest Financing Agreement      
Minimum cash and cash equivalents required to be maintained deposits after repayment $ 10.0    
Revenue Interest Financing Agreement | Sagard      
Revenue Interest Financing Agreement      
Investment amount $ 32.5    
Hard Cap expressed as a percentage of the Investment Amount 190.00%    
Hard cap amount $ 61.8    
Revenue Interest Financing Agreement | Each calendar quarter from and after the Closing Date through and including the quarter ended June 30, 2026 | Sagard      
Revenue Interest Financing Agreement      
Quarterly payments due, expressed as a percentage of the first $100 million in annual Product Revenue of the Included Products 15.00%    
Quarterly payments due, expressed as a percentage of the annual Product Revenue of the Included Products in excess of $100 million 7.50%    
Annual Product Revenue Threshold $ 100.0    
Revenue Interest Financing Agreement | Period Ending December 31, 2027 | Sagard      
Revenue Interest Financing Agreement      
Minimum amount expressed as a percentage of the Investment Amount 100.00%    
Revenue Interest Financing Agreement | Period Ending December 31, 2032 | Sagard      
Revenue Interest Financing Agreement      
Minimum amount expressed as a percentage of the Investment Amount 190.00%    
Revenue Interest Financing Agreement | On Or Before Third Anniversary      
Revenue Interest Financing Agreement      
Payments at repurchase price investment percent 160.00%    
Revenue Interest Financing Agreement | After Third Anniversary      
Revenue Interest Financing Agreement      
Payments at repurchase price investment percent 180.00%    
Royalty monetization agreement | After Fourth Anniversary      
Revenue Interest Financing Agreement      
Payments at repurchase price investment percent 190.00%