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Assets and Liabilities Measured at Fair Value (Details) $ in Thousands | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | ---
Assets: |  |
Fair value of assets | $ 365,490 | $ 311,700
Liabilities: |  |
Contingent consideration payable | 28,100 | 25,400
Deferred compensation plan liability | 2,996 | 2,258
Fair value of liabilities | 31,096 | 27,658
T B200 Pompe Program | Contingent Consideration Liability Clinical and Regulatory Milestones | Callidus Biopharma Inc |  |
Liabilities: |  |
Contingent consideration payable | $ 27,600 |
T B200 Pompe Program | Minimum | Contingent Consideration Liability Clinical and Regulatory Milestones | Probability of Milestone Achievement | Callidus Biopharma Inc |  |
Liabilities: |  |
Discount rate | 0.710 |
T B200 Pompe Program | Maximum | Contingent Consideration Liability Clinical and Regulatory Milestones | Probability of Milestone Achievement | Callidus Biopharma Inc |  |
Liabilities: |  |
Discount rate | 1.000 |
Commercial paper |  |
Assets: |  |
Fair value of assets | $ 82,655 | 79,803
Asset-backed securities |  |
Assets: |  |
Fair value of assets | 52,101 | 30,287
Corporate debt securities |  |
Assets: |  |
Fair value of assets | 227,399 | 199,012
Money market funds |  |
Assets: |  |
Fair value of assets | 3,335 | 2,598
Level 2 |  |
Assets: |  |
Fair value of assets | 365,490 | 311,700
Liabilities: |  |
Contingent consideration payable | 0 | 0
Deferred compensation plan liability | 2,996 | 2,258
Fair value of liabilities | 2,996 | 2,258
Convertible debt, fair value | 531,200 |
Level 2 | Commercial paper |  |
Assets: |  |
Fair value of assets | 82,655 | 79,803
Level 2 | Asset-backed securities |  |
Assets: |  |
Fair value of assets | 52,101 | 30,287
Level 2 | Corporate debt securities |  |
Assets: |  |
Fair value of assets | 227,399 | 199,012
Level 2 | Money market funds |  |
Assets: |  |
Fair value of assets | 3,335 | 2,598
Level 3 |  |
Liabilities: |  |
Contingent consideration payable | 28,100 | 25,400
Deferred compensation plan liability | 0 | 0
Fair value of liabilities | $ 28,100 | $ 25,400
Level 3 | T B200 Pompe Program | Contingent Consideration Liability Clinical and Regulatory Milestones | Probability Weighted Discounted Cash Flow | Discount Rate | Callidus Biopharma Inc |  |
Liabilities: |  |
Discount rate | 0.10 |

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