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Business Combination - Narrative (Details) - USD ($) $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
Aug. 23, 2018 | Jun. 30, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |
Contingent consideration payable |  | $ 336,200 | $ 310,240
Estimated fair value of deferred consideration payable |  | 18,800 | $ 18,300
Agilis |  |  |
Business Acquisition [Line Items] |  |  |
Cash consideration | $ 49,200 |  |
Equity Interest Issued, number of shares (in shares) | 3,500,907 |  |
Numerator for calculation of number of shares of equity interests issued to acquire entity | $ 150,000 |  |
Trading day period | 10 days |  |
Development milestone payments which the entity is obligated to pay | $ 40,000 |  |
Maximum | Agilis |  |  |
Business Acquisition [Line Items] |  |  |
Development milestone payments which the entity is obligated to pay |  | 60,000 |
Milestone, potential achievements, priority review voucher amount |  | 535,000 |
Milestone, potential achievements, net sales amount |  | $ 150,000 |
Milestone, potential achievements, product sales |  | 6.00% |
Minimum | Agilis |  |  |
Business Acquisition [Line Items] |  |  |
Milestone, potential achievements, product sales |  | 2.00% |

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