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Subsequent Events (Details) - USD ($)
$ in Millions
Oct. 28, 2022
May 11, 2021
Oaktree Capital Management LP Credit Agreement    
Subsequent Events    
Exit fee, percentage   2.00%
Subsequent events | Oaktree Capital Management LP Credit Agreement    
Subsequent Events    
Exit fee, percentage 2.67%  
Subsequent events | Revenue Interest Financing Agreement | Oaktree Capital Management LP Credit Agreement    
Subsequent Events    
Minimum cash and cash equivalents required to be maintained deposits until repayment $ 15.0  
Minimum cash and cash equivalents required to be maintained deposits after repayment 10.0  
Subsequent events | Revenue Interest Financing Agreement | Sagard Healthcare Partners    
Subsequent Events    
Investment amount $ 32.5  
Hard Cap expressed as a percentage of the Investment Amount 190.00%  
Subsequent events | Revenue Interest Financing Agreement | Each calendar quarter from and after the Closing Date through and including the quarter ended June 30, 2026 | Sagard Healthcare Partners    
Subsequent Events    
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%  
Subsequent events | Revenue Interest Financing Agreement | Each Calendar Quarter Following the Calendar Quarter Ended June 30, 2026 | Sagard Healthcare Partners    
Subsequent Events    
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  
Subsequent events | Revenue Interest Financing Agreement | Period Ending December 31, 2027 | Sagard Healthcare Partners    
Subsequent Events    
Minimum Amount expressed as a percentage of the Investment Amount 100.00%  
Subsequent events | Revenue Interest Financing Agreement | Period Ending December 31, 2032 | Sagard Healthcare Partners    
Subsequent Events    
Minimum Amount expressed as a percentage of the Investment Amount 190.00%  
Subsequent events | Revenue Interest Financing Agreement | On Or Before Third Anniversary    
Subsequent Events    
Payments at repurchase price investment percent 160.00%  
Subsequent events | Revenue Interest Financing Agreement | After Third Anniversary    
Subsequent Events    
Payments at repurchase price investment percent 180.00%  
Subsequent events | Revenue Interest Financing Agreement | After Fourth Anniversary    
Subsequent Events    
Payments at repurchase price investment percent 190.00%