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Assets and Liabilities Measured at Fair Value - Significant Unobservable Inputs (Details) $ in Thousands | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Contingent consideration payable | $ 27,317 | $ 25,825
Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Contingent consideration payable | 27,317 | $ 25,825
Callidus Biopharma Inc | Clinical and regulatory milestones | ATB200 Pompe Program |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Contingent consideration payable | $ 25,914 |
Callidus Biopharma Inc | Clinical and regulatory milestones | Probability of achievement of milestones | ATB200 Pompe Program | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Contingent consideration, measurement input | 0.75 |
Callidus Biopharma Inc | Clinical and regulatory milestones | Probability of achievement of milestones | ATB200 Pompe Program | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Contingent consideration, measurement input | 0.78 |
Callidus Biopharma Inc | Clinical and regulatory milestones | Level 3 | Discount rate | ATB200 Pompe Program | Probability weighted discounted cash flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Contingent consideration, measurement input | 0.075 |

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