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Divestiture of the Pediatric Assets - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended
Feb. 12, 2018
Jan. 31, 2021
Dec. 31, 2013
Dec. 31, 2019
Oct. 10, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Percentage of royalty payable on net sales     0.834%      
Guarantee to Deerfield       $ 1,372   $ 5,717
2016 MIPA | Discontinued Operations, Disposed of by Sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Debt instrument, periodic payment, interest $ 263          
Noncash or part noncash acquisition, debt assumed 2,625          
Research and development reimbursement, in excess of 1,000          
Guarantee to Deerfield 6,643          
Guaranty assets $ 6,620          
2016 MIPA | Discontinued Operations, Disposed of by Sale | FSC            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Percentage of royalty payable on net sales 15.00%          
Royalty payable on net sales, maximum $ 10,300          
2016 MIPA | Discontinued Operations, Disposed of by Sale | Scenario, Forecast            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Repayments of assumed debt   $ 15,263        
Cerecor | Discontinued Operations, Disposed of by Sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Guarantee to Deerfield       1,827    
Guaranty assets       $ 1,821 $ 15,000  
Escrow deposit         $ 15,000