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Assets and Liabilities Measured at Fair Value - Significant Unobservable Inputs (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Contingent consideration payable $ 19,151 $ 20,339
Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Contingent consideration payable 19,151 $ 20,339
Callidus Biopharma Inc | Clinical and regulatory milestones | ATB200 Pompe Program    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Contingent consideration payable $ 19,151  
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 75.00%  
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 88.00%  
Callidus Biopharma Inc | Clinical and regulatory milestones | Discount rate | Discount rate | ATB200 Pompe Program | Probability weighted discounted cash flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Contingent consideration, measurement input 7.50%