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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, 2018
Dec. 31, 2017
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       $ 5,717 $ 0
2016 MIPA | Discontinued Operations, Disposed of by Sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Noncash or part noncash acquisition, debt assumed $ 2,625        
Debt instrument, periodic payment, interest 263        
Research and development reimbursement, in excess of 1,000        
Guarantee to Deerfield 6,643     6,253  
Guaranty assets $ 6,620     $ 6,231  
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