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Revenue Interest Financing Agreement - Terms (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 28, 2022
Mar. 31, 2023
Dec. 31, 2022
Revenue Interest Financing Payable      
Professional fees   $ 898 $ 1,417
Total issuance costs   $ 2,600  
Estimated effective annual interest rate, percentage   19.00%  
Each calendar quarter from and after the Closing Date through and including the quarter ended June 30, 2026 | Sagard      
Revenue Interest Financing Payable      
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%    
Period Ending December 31, 2032 | Sagard      
Revenue Interest Financing Payable      
Minimum amount expressed as a percentage of the Investment Amount 190.00%    
Revenue Interest Financing Agreement. | Oaktree Capital Management LP Credit Agreement      
Revenue Interest Financing Payable      
Minimum cash and cash equivalents required to be maintained deposits until repayment $ 15,000    
Minimum cash and cash equivalents required to be maintained deposits after repayment 10,000    
Revenue Interest Financing Agreement. | Sagard      
Revenue Interest Financing Payable      
Investment amount $ 32,500    
Hard Cap expressed as a percentage of the Investment Amount 190.00%    
Hard cap amount $ 61,800    
Professional fees   $ 2,600  
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 Payable      
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 $ 100,000    
Revenue Interest Financing Agreement. | Period Ending December 31, 2027 | Sagard      
Revenue Interest Financing Payable      
Minimum amount expressed as a percentage of the Investment Amount 100.00%    
Revenue Interest Financing Agreement. | On Or Before Third Anniversary      
Revenue Interest Financing Payable      
Payments at repurchase price investment percent 160.00%    
Revenue Interest Financing Agreement. | After Third Anniversary      
Revenue Interest Financing Payable      
Payments at repurchase price investment percent 180.00%    
Revenue Interest Financing Agreement. | After Fourth Anniversary      
Revenue Interest Financing Payable      
Payments at repurchase price investment percent 190.00%