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Revenue Interest Financing Agreement - Terms (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Oct. 24, 2024
Oct. 28, 2022
Jun. 30, 2024
Sep. 30, 2024
Revenue Interest Financing Agreement        
Total issuance costs     $ 0.1 $ 2.6
Estimated effective annual interest rate, percentage       17.00%
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%    
Subsequent events        
Revenue Interest Financing Agreement        
Estimated effective annual interest rate, percentage 13.00%