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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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