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Assets and Liabilities Measured at Fair Value - Components by Hierarchy Level (Details) $ in Thousands | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | ---
Assets: |  |
Fair value of assets | $ 218,619 | $ 314,270
Liabilities: |  |
Contingent consideration payable | 23,612 | 22,681
Deferred compensation plan liability | 3,055 | 4,419
Fair value of liabilities | 26,667 | 27,100
ATB200 Pompe Program | Contingent Consideration Liability Clinical and Regulatory Milestones | Callidus Biopharma Inc |  |
Liabilities: |  |
Contingent consideration payable | $ 22,985 |
ATB200 Pompe Program | Contingent Consideration Liability Clinical and Regulatory Milestones | Probability of Milestone Achievement | Minimum | Callidus Biopharma Inc |  |
Liabilities: |  |
Measurement input | 0.75 |
ATB200 Pompe Program | Contingent Consideration Liability Clinical and Regulatory Milestones | Probability of Milestone Achievement | Maximum | Callidus Biopharma Inc |  |
Liabilities: |  |
Measurement input | 0.78 |
Commercial paper |  |
Assets: |  |
Fair value of assets | $ 35,348 | 73,710
Asset-backed securities |  |
Assets: |  |
Fair value of assets | 68,795 | 77,810
Corporate debt securities |  |
Assets: |  |
Fair value of assets | 107,098 | 145,991
U.S. government agency bonds |  |
Assets: |  |
Fair value of assets | 4,000 | 11,991
Money market funds |  |
Assets: |  |
Fair value of assets | 3,378 | 4,768
Level 2 |  |
Assets: |  |
Fair value of assets | 218,619 | 314,270
Liabilities: |  |
Contingent consideration payable | 0 | 0
Deferred compensation plan liability | 3,055 | 4,419
Fair value of liabilities | 3,055 | 4,419
Fair value of the Convertible Notes | 4,700 |
Level 2 | Commercial paper |  |
Assets: |  |
Fair value of assets | 35,348 | 73,710
Level 2 | Asset-backed securities |  |
Assets: |  |
Fair value of assets | 68,795 | 77,810
Level 2 | Corporate debt securities |  |
Assets: |  |
Fair value of assets | 107,098 | 145,991
Level 2 | U.S. government agency bonds |  |
Assets: |  |
Fair value of assets | 4,000 | 11,991
Level 2 | Money market funds |  |
Assets: |  |
Fair value of assets | 3,378 | 4,768
Level 3 |  |
Liabilities: |  |
Contingent consideration payable | 23,612 | 22,681
Deferred compensation plan liability | 0 | 0
Fair value of liabilities | $ 23,612 | $ 22,681
Level 3 | ATB200 Pompe Program | Contingent Consideration Liability Clinical and Regulatory Milestones | Probability Weighted Discounted Cash Flow | Discount Rate | Callidus Biopharma Inc |  |
Liabilities: |  |
Measurement input | 0.094 |

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