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v3.19.2

Assets and Liabilities Measured at Fair Value - Components by Hierarchy Level (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Assets: |  |  |
Fair value of assets |  | $ 358,901 | $ 427,084
Liabilities: |  |  |
Contingent consideration payable |  | 21,247 | 19,700
Deferred compensation plan liability |  | 3,874 | 2,732
Fair value of liabilities |  | 25,121 | 22,432
Exchange agreement, aggregate principal amount |  | 247,200 |
Milestone payment, stock issued as consideration |  | 9,000 |
Common Stock |  |  |
Liabilities: |  |  |
Milestone payment, stock issued as consideration | $ 9,300 |  |
ATB200 Pompe Program | Contingent Consideration Liability Clinical and Regulatory Milestones | Callidus Biopharma Inc |  |  |
Liabilities: |  |  |
Contingent consideration payable |  | $ 20,999 |
ATB200 Pompe Program | Contingent Consideration Liability Clinical and Regulatory Milestones | Probability of Milestone Achievement | Minimum | Callidus Biopharma Inc |  |  |
Liabilities: |  |  |
Discount rate |  | 0.75 |
ATB200 Pompe Program | Contingent Consideration Liability Clinical and Regulatory Milestones | Probability of Milestone Achievement | Maximum | Callidus Biopharma Inc |  |  |
Liabilities: |  |  |
Discount rate |  | 0.78 |
Commercial paper |  |  |
Assets: |  |  |
Fair value of assets |  | $ 112,026 | 115,141
Asset-backed securities |  |  |
Assets: |  |  |
Fair value of assets |  | 73,093 | 68,135
Corporate debt securities |  |  |
Assets: |  |  |
Fair value of assets |  | 169,558 | 240,726
Money market funds |  |  |
Assets: |  |  |
Fair value of assets |  | 4,224 | 3,082
Level 2 |  |  |
Assets: |  |  |
Fair value of assets |  | 358,901 | 427,084
Liabilities: |  |  |
Contingent consideration payable |  | 0 | 0
Deferred compensation plan liability |  | 3,874 | 2,732
Fair value of liabilities |  | 3,874 | 2,732
Convertible debt, fair value |  | 6,100 |
Level 2 | Commercial paper |  |  |
Assets: |  |  |
Fair value of assets |  | 112,026 | 115,141
Level 2 | Asset-backed securities |  |  |
Assets: |  |  |
Fair value of assets |  | 73,093 | 68,135
Level 2 | Corporate debt securities |  |  |
Assets: |  |  |
Fair value of assets |  | 169,558 | 240,726
Level 2 | Money market funds |  |  |
Assets: |  |  |
Fair value of assets |  | 4,224 | 3,082
Level 3 |  |  |
Liabilities: |  |  |
Contingent consideration payable |  | 21,247 | 19,700
Deferred compensation plan liability |  | 0 | 0
Fair value of liabilities |  | $ 21,247 | $ 19,700
Level 3 | ATB200 Pompe Program | Contingent Consideration Liability Clinical and Regulatory Milestones | Probability Weighted Discounted Cash Flow | Discount Rate | Callidus Biopharma Inc |  |  |
Liabilities: |  |  |
Discount rate |  | 0.101 |

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