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Fair Value of Financial Instruments - Quantitative Information and Assumptions Pertaining To The Fair Value Measurement of The Level 3 Inputs (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Jun. 19, 2020
USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]    
Contingent receivable $ 11,300  
Contingent consideration liabilities 15,800  
Level 3    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Contingent receivable 11,300 $ 10,100
Contingent consideration liabilities 15,800 16,600
Regulatory milestone | Level 3    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Contingent receivable $ 3,200 $ 3,100
Regulatory milestone | Level 3 | Probability of success | Probability adjusted discounted cash flow model    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Asset measurement input 0.90 0.90
Regulatory milestone | Level 3 | Discount rate | Probability adjusted discounted cash flow model    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Asset measurement input 0.24 0.23
Royalties | Level 3    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Contingent receivable $ 8,100 $ 7,000
Royalties | Level 3 | Probability of success | Probability adjusted discounted cash flow model | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Asset measurement input 0.13  
Royalties | Level 3 | Probability of success | Probability adjusted discounted cash flow model | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Asset measurement input 0.77  
Royalties | Level 3 | Discount rate | Probability adjusted discounted cash flow model    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Asset measurement input 0.24 0.23
Contingent Value Right | Level 3    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Contingent consideration liabilities $ 4,200 $ 3,700
Contingent Value Right | Level 3 | Discount rate | Monte-Carlo simulation    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Liability measurement input 0.24 0.23
1095 commercialization milestone | Level 3    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Contingent consideration liabilities $ 2,200 $ 2,200
1095 commercialization milestone | Level 3 | Probability of success | Probability adjusted discounted cash flow model    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Liability measurement input 0.45 0.45
1095 commercialization milestone | Level 3 | Discount rate | Probability adjusted discounted cash flow model    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Liability measurement input 0.0051 0.0048
Net sales targets - AZEDRA and 1095 | Level 3    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Contingent consideration liabilities $ 9,400 $ 10,700
Net sales targets - AZEDRA and 1095 | Level 3 | Probability of success | Monte-Carlo simulation | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Liability measurement input 0.40  
Net sales targets - AZEDRA and 1095 | Level 3 | Probability of success | Monte-Carlo simulation | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Liability measurement input 1  
Net sales targets - AZEDRA and 1095 | Level 3 | Discount rate | Monte-Carlo simulation | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Liability measurement input 0.23 0.22
Net sales targets - AZEDRA and 1095 | Level 3 | Discount rate | Monte-Carlo simulation | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Liability measurement input 0.24 0.23