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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Money market funds | ISP Fund LP |  |
Assets |  |
Total assets measured at estimated fair value | $ 284,800 |
Equity investment | ISP Fund LP |  |
Assets |  |
Total assets measured at estimated fair value | 14,500 |
Recurring basis |  |
Assets |  |
Total assets measured at estimated fair value | 627,254 | $ 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 | 204,808 | 233,992
Recurring basis | Equity investments and Money market funds | ISP Fund LP |  |
Assets |  |
Total assets measured at estimated fair value | 299,288 |
Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 |  |
Assets |  |
Total assets measured at estimated fair value | 576,176 | 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 | 204,808 | 233,992
Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | Equity investments and Money market funds | ISP Fund LP |  |
Assets |  |
Total assets measured at estimated fair value | 299,288 |
Recurring basis | Significant Other Observable Inputs, Level 2 |  |
Assets |  |
Total assets measured at estimated fair value | 49,931 | 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 investments and Money market funds | ISP Fund LP |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Recurring basis | Significant Unobservable Inputs, Level 3 |  |
Assets |  |
Total assets measured at estimated fair value | 1,147 | 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 investments and Money market funds | ISP Fund LP |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Nonrecurring basis | Debt |  |
Debt |  |
2023 Notes | 239,779 | 243,394
2025 Notes | 206,135 | 208,976
Total fair value of debt | 445,914 | 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 | 239,779 | 243,394
2025 Notes | 206,135 | 208,976
Total fair value of debt | 445,914 | 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
Armata | Recurring basis | Equity investment | Common stock |  |
Assets |  |
Total assets measured at estimated fair value | 25,958 |
Armata | Recurring basis | Equity investment | Warrants |  |
Assets |  |
Total assets measured at estimated fair value | 18,049 |
Armata | Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | Equity investment | Common stock |  |
Assets |  |
Total assets measured at estimated fair value | 25,958 |
Armata | Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | Equity investment | Warrants |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Armata | Recurring basis | Significant Other Observable Inputs, Level 2 | Equity investment | Common stock |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Armata | Recurring basis | Significant Other Observable Inputs, Level 2 | Equity investment | Warrants |  |
Assets |  |
Total assets measured at estimated fair value | 18,049 |
Armata | Recurring basis | Significant Unobservable Inputs, Level 3 | Equity investment | Common stock |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Armata | Recurring basis | Significant Unobservable Inputs, Level 3 | Equity investment | Warrants |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Entasis | Recurring basis | Equity investment | Common stock |  |
Assets |  |
Total assets measured at estimated fair value | 46,122 |
Entasis | Recurring basis | Equity investment | Warrants |  |
Assets |  |
Total assets measured at estimated fair value | 31,882 |
Entasis | Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | Equity investment | Common stock |  |
Assets |  |
Total assets measured at estimated fair value | 46,122 |
Entasis | Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | Equity investment | Warrants |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Entasis | Recurring basis | Significant Other Observable Inputs, Level 2 | Equity investment | Common stock |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Entasis | Recurring basis | Significant Other Observable Inputs, Level 2 | Equity investment | Warrants |  |
Assets |  |
Total assets measured at estimated fair value | 31,882 |
Entasis | Recurring basis | Significant Unobservable Inputs, Level 3 | Equity investment | Common stock |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
Entasis | Recurring basis | Significant Unobservable Inputs, Level 3 | Equity investment | Warrants |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
InCarda | Recurring basis | Equity investment | Warrants |  |
Assets |  |
Total assets measured at estimated fair value | 1,147 |
InCarda | Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | Equity investment | Warrants |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
InCarda | Recurring basis | Significant Other Observable Inputs, Level 2 | Equity investment | Warrants |  |
Assets |  |
Total assets measured at estimated fair value | 0 |
InCarda | Recurring basis | Significant Unobservable Inputs, Level 3 | Equity investment | Warrants |  |
Assets |  |
Total assets measured at estimated fair value | $ 1,147 |

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