Fair Value of Financial Instruments - Quantitative Information and Assumptions Pertaining To The Fair Value Measurement of The Level 3 Inputs (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]
Business Combination, Contingent Consideration, Asset	$ 10,200
Contingent consideration liabilities	17,200
Level 3
Fair Value, Option, Quantitative Disclosures [Line Items]
Business Combination, Contingent Consideration, Asset	10,200
Contingent consideration liabilities	17,200
Level 3 | Regulatory milestone
Fair Value, Option, Quantitative Disclosures [Line Items]
Business Combination, Contingent Consideration, Asset	3,100
Level 3 | Royalties
Fair Value, Option, Quantitative Disclosures [Line Items]
Business Combination, Contingent Consideration, Asset	7,100
Level 3 | CVRs
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent consideration liabilities	3,900
Level 3 | 1095 commercialization milestone
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent consideration liabilities	2,200
Level 3 | Net sales targets - AZEDRA and 1095
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent consideration liabilities	$ 11,100
Level 3 | Monte-Carlo simulation | Probability of success | Net sales targets - AZEDRA and 1095 | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Liability measurement input	0.40
Level 3 | Monte-Carlo simulation | Probability of success | Net sales targets - AZEDRA and 1095 | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Liability measurement input	1
Level 3 | Monte-Carlo simulation | Discount rate | CVRs
Fair Value, Option, Quantitative Disclosures [Line Items]
Liability measurement input	0.24
Level 3 | Monte-Carlo simulation | Discount rate | Net sales targets - AZEDRA and 1095 | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Liability measurement input	0.23
Level 3 | Monte-Carlo simulation | Discount rate | Net sales targets - AZEDRA and 1095 | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Liability measurement input	0.24
Level 3 | Probability adjusted discounted cash flow model | Probability of success | Regulatory milestone
Fair Value, Option, Quantitative Disclosures [Line Items]
Asset measurement input	0.90
Level 3 | Probability adjusted discounted cash flow model | Probability of success | Royalties | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Asset measurement input	0.13
Level 3 | Probability adjusted discounted cash flow model | Probability of success | Royalties | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Asset measurement input	0.77
Level 3 | Probability adjusted discounted cash flow model | Probability of success | 1095 commercialization milestone
Fair Value, Option, Quantitative Disclosures [Line Items]
Liability measurement input	0.45
Level 3 | Probability adjusted discounted cash flow model | Discount rate | Regulatory milestone
Fair Value, Option, Quantitative Disclosures [Line Items]
Asset measurement input	0.23
Level 3 | Probability adjusted discounted cash flow model | Discount rate | Royalties
Fair Value, Option, Quantitative Disclosures [Line Items]
Asset measurement input	0.23
Level 3 | Probability adjusted discounted cash flow model | Discount rate | 1095 commercialization milestone
Fair Value, Option, Quantitative Disclosures [Line Items]
Liability measurement input	0.0048