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Financial Instruments and Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Recurring basis |  |
Assets |  |
Total assets measured at estimated fair value | $ 541,889 | $ 306,741
Recurring basis | U.S. government securities |  |
Assets |  |
Total assets measured at estimated fair value |  | 53,834
Recurring basis | U.S. commercial paper |  |
Assets |  |
Total assets measured at estimated fair value |  | 18,915
Recurring basis | Money market funds |  |
Assets |  |
Total assets measured at estimated fair value | 430,144 | 233,992
Recurring basis | Equity Investment | Common stock | Armata |  |
Assets |  |
Total assets measured at estimated fair value | 27,787 |
Recurring basis | Equity Investment | Common stock | Entasis |  |
Assets |  |
Total assets measured at estimated fair value | 38,093 |
Recurring basis | Equity Investment | Warrants | Armata |  |
Assets |  |
Total assets measured at estimated fair value | 20,167 |
Recurring basis | Equity Investment | Warrants | Entasis |  |
Assets |  |
Total assets measured at estimated fair value | 25,698 |
Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 |  |
Assets |  |
Total assets measured at estimated fair value | 496,024 | 233,992
Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | U.S. government securities |  |
Assets |  |
Total assets measured at estimated fair value |  | 0
Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | U.S. commercial paper |  |
Assets |  |
Total assets measured at estimated fair value |  | 0
Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | Money market funds |  |
Assets |  |
Total assets measured at estimated fair value | 430,144 | 233,992
Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | Equity Investment | Common stock | Armata |  |
Assets |  |
Total assets measured at estimated fair value | 27,787 |
Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | Equity Investment | Common stock | Entasis |  |
Assets |  |
Total assets measured at estimated fair value | 38,093 |
Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | Equity Investment | Warrants | Armata |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | Equity Investment | Warrants | Entasis |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Recurring basis | Significant Other Observable Inputs, Level 2 |  |
Assets |  |
Total assets measured at estimated fair value | 45,865 | 72,749
Recurring basis | Significant Other Observable Inputs, Level 2 | U.S. government securities |  |
Assets |  |
Total assets measured at estimated fair value |  | 53,834
Recurring basis | Significant Other Observable Inputs, Level 2 | U.S. commercial paper |  |
Assets |  |
Total assets measured at estimated fair value |  | 18,915
Recurring basis | Significant Other Observable Inputs, Level 2 | Money market funds |  |
Assets |  |
Total assets measured at estimated fair value | 0 | 0
Recurring basis | Significant Other Observable Inputs, Level 2 | Equity Investment | Common stock | Armata |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Recurring basis | Significant Other Observable Inputs, Level 2 | Equity Investment | Common stock | Entasis |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Recurring basis | Significant Other Observable Inputs, Level 2 | Equity Investment | Warrants | Armata |  |
Assets |  |
Total assets measured at estimated fair value | 20,167 |
Recurring basis | Significant Other Observable Inputs, Level 2 | Equity Investment | Warrants | Entasis |  |
Assets |  |
Total assets measured at estimated fair value | 25,698 |
Recurring basis | Significant Unobservable Inputs, Level 3 |  |
Assets |  |
Total assets measured at estimated fair value | 0 | 0
Recurring basis | Significant Unobservable Inputs, Level 3 | U.S. government securities |  |
Assets |  |
Total assets measured at estimated fair value |  | 0
Recurring basis | Significant Unobservable Inputs, Level 3 | U.S. commercial paper |  |
Assets |  |
Total assets measured at estimated fair value |  | 0
Recurring basis | Significant Unobservable Inputs, Level 3 | Money market funds |  |
Assets |  |
Total assets measured at estimated fair value | 0 | 0
Recurring basis | Significant Unobservable Inputs, Level 3 | Equity Investment | Common stock | Armata |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Recurring basis | Significant Unobservable Inputs, Level 3 | Equity Investment | Common stock | Entasis |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Recurring basis | Significant Unobservable Inputs, Level 3 | Equity Investment | Warrants | Armata |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Recurring basis | Significant Unobservable Inputs, Level 3 | Equity Investment | Warrants | Entasis |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Nonrecurring basis | Debt |  |
Debt |  |
2023 Notes | 230,494 | 243,394
2025 Notes | 191,491 | 208,976
Total fair value of debt | 421,985 | 452,370
Nonrecurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | Debt |  |
Debt |  |
2023 Notes | 0 | 0
2025 Notes | 0 | 0
Total fair value of debt | 0 | 0
Nonrecurring basis | Significant Other Observable Inputs, Level 2 | Debt |  |
Debt |  |
2023 Notes | 230,494 | 243,394
2025 Notes | 191,491 | 208,976
Total fair value of debt | 421,985 | 452,370
Nonrecurring basis | Significant Unobservable Inputs, Level 3 | Debt |  |
Debt |  |
2023 Notes | 0 | 0
2025 Notes | 0 | 0
Total fair value of debt | $ 0 | $ 0

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- Definition Fair value portion of long-term notes which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. Senior debt has the highest claim on the assets of the issuer in case of bankruptcy or liquidation, due within one year or the normal operating cycle, if longer. Senior note holders are paid off in full before any payments are made to debt holders having a lesser priority of repayment. + References No definition available. + Details
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