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EQUITY AND LONG-TERM INVESTMENTS AND FAIR VALUE MEASUREMENTS - Schedule of Available-for-Sale Securities Measured at Fair Value on a Recurring Basis (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Fair Value Measurements |  |  |  |  |
2025 Notes |  | $ 0 |  |  |
Contingent value rights liability |  | $ 359,000 |  | $ 595,000 |
ISP Fund LP |  |  |  |  |
Liabilities |  |  |  |  |
Lock-up period |  | 36 months |  | 36 months |
Contributed to partnership for investing |  | $ 300,000,000 |  | $ 300,000 |
Withdrawal from investment |  | 0 |  |  |
Money market funds | ISP Fund LP |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 62,900,000 |  | 25,100,000 |
Equity investment | ISP Fund LP |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 248,500,000 |  | 295,400,000 |
Private Placement Positions And Convertible Notes | ISP Fund LP |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 60,600,000 |  | 54,600,000 |
Recurring basis |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 705,963,000 |  | 639,488,000 |
Recurring basis | Money market funds |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 170,706,000 |  | 263,469,000 |
Recurring basis | Term Loan Investment |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 27,044,000 |  |  |
Recurring basis | Term Loan Investment | Armata Term Loan |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 0 |  |  |
Recurring basis | Equity investments and Money market funds | ISP Fund LP |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 311,812,000 | [1] | 320,560,000 | [2]
Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 503,162,000 |  | 560,546,000 |
Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | ISP Fund LP |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value | [1] | 251,207,000 |  |  |
Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | Money market funds |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 170,706,000 |  | 263,469,000 |
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 | [2] |  |  | 265,982,000 |
Recurring basis | Significant Other Observable Inputs, Level 2 |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 35,297,000 |  | 8,059,000 |
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 | Term Loan Investment |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 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 | [1] | 0 | [2]
Recurring basis | Significant Unobservable Inputs, Level 3 |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 167,504,000 |  | 70,883,000 |
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 | Term Loan Investment |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 27,044,000 |  |  |
Recurring basis | Significant Unobservable Inputs, Level 3 | Equity investments and Money market funds | ISP Fund LP |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 60,605,000 | [1] | 54,578,000 | [2]
Nonrecurring basis |  |  |  |  |
Fair Value Measurements |  |  |  |  |
Contingent value rights liability |  | 359,000 |  | 595,000 |
Liabilities |  |  |  |  |
Total liabilities at estimated fair value |  | 427,836,000 |  | 506,259,000 |
Nonrecurring basis | Debt |  |  |  |  |
Fair Value Measurements |  |  |  |  |
2023 Notes |  |  |  | 96,089,000 |
2025 Notes |  | 200,407,000 |  | 197,807,000 |
2028 Notes |  | 227,070,000 |  | 211,768,000 |
Total fair value of debt |  | 427,477,000 |  | 505,664,000 |
Nonrecurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 |  |  |  |  |
Fair Value Measurements |  |  |  |  |
Contingent value rights liability |  | 0 |  | 0 |
Liabilities |  |  |  |  |
Total liabilities at estimated fair value |  | 0 |  | 0 |
Nonrecurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | Debt |  |  |  |  |
Fair Value Measurements |  |  |  |  |
2023 Notes |  |  |  | 0 |
2025 Notes |  | 0 |  | 0 |
2028 Notes |  | 0 |  | 0 |
Total fair value of debt |  | 0 |  | 0 |
Nonrecurring basis | Significant Other Observable Inputs, Level 2 |  |  |  |  |
Fair Value Measurements |  |  |  |  |
2028 Notes |  | 227,070,000 |  |  |
Contingent value rights liability |  | 0 |  | 0 |
Total fair value of debt |  | 427,477,000 |  |  |
Liabilities |  |  |  |  |
Total liabilities at estimated fair value |  | 427,477,000 |  | 505,664,000 |
Nonrecurring basis | Significant Other Observable Inputs, Level 2 | Debt |  |  |  |  |
Fair Value Measurements |  |  |  |  |
2023 Notes |  |  |  | 96,089,000 |
2025 Notes |  | 200,407,000 |  | 197,807,000 |
2028 Notes |  |  |  | 211,768,000 |
Total fair value of debt |  |  |  | 505,664,000 |
Nonrecurring basis | Significant Unobservable Inputs, Level 3 |  |  |  |  |
Fair Value Measurements |  |  |  |  |
Contingent value rights liability |  | 359,000 |  | 595,000 |
Liabilities |  |  |  |  |
Total liabilities at estimated fair value |  | 359,000 |  | 595,000 |
Nonrecurring basis | Significant Unobservable Inputs, Level 3 | Debt |  |  |  |  |
Fair Value Measurements |  |  |  |  |
2023 Notes |  |  |  | 0 |
2025 Notes |  |  |  | 0 |
2028 Notes |  | 0 |  | 0 |
Total fair value of debt |  | 0 |  | 0 |
Armata | Recurring basis | Convertible debt investment |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 51,883,000 |  |  |
Armata | Recurring basis | Equity investment | Common stock |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 81,249,000 |  | 31,095,000 |
Armata | Recurring basis | Equity investment | Warrants |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 35,297,000 |  | 8,059,000 |
Armata | Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | Convertible debt investment |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 0 |  |  |
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 |  | 81,249,000 |  | 31,095,000 |
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 |  | 0 |
Armata | Recurring basis | Significant Other Observable Inputs, Level 2 | Convertible debt investment |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 0 |  |  |
Armata | Recurring basis | Significant Other Observable Inputs, Level 2 | Equity investment |  |  |  |  |
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 |  | 35,297,000 |  | 8,059,000 |
Armata | Recurring basis | Significant Unobservable Inputs, Level 3 | Convertible debt investment |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 51,883,000 |  |  |
Armata | Recurring basis | Significant Unobservable Inputs, Level 3 | Equity investment | Common stock |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 0 |  | 0 |
Armata | Recurring basis | Significant Unobservable Inputs, Level 3 | Equity investment | Warrants |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 0 |  | 0 |
InCarda | Recurring basis | Equity investment | Warrants |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  |  |  | 605,000 |
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 |  |  |  | 605,000 |
Gate Neurosciences Member | Recurring basis | Convertible debt investment |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 27,972,000 |  | 15,700,000 |
Gate Neurosciences Member | Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | Convertible debt investment |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 0 |  | 0 |
Gate Neurosciences Member | Recurring basis | Significant Other Observable Inputs, Level 2 | Convertible debt investment |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | 0 |  | 0 |
Gate Neurosciences Member | Recurring basis | Significant Unobservable Inputs, Level 3 | Convertible debt investment |  |  |  |  |
Assets |  |  |  |  |
Total assets measured at estimated fair value |  | $ 27,972,000 |  | $ 15,700,000 |
[1] | The investments held by ISP Fund LP, consisted of $248.5 million in equity investments, which included private placement positions of $60.6 million, and $62.9 million in money market funds. A certain portion of the total capital contribution of $300.0 million is no longer subject to a 36-month lock-up period from the date of such capital contribution. However, we did no t elect to make a withdrawal in 2023, thereby extending the lock-up period and withdrawal elections into subsequent years.
[2] | The investments held by ISP Fund LP, consisted of $295.4 million in equity investments, which included private placement positions and convertible notes of $54.6 million, and $25.1 million in money market funds. Our total capital contribution of $300.0 million was subject to a 36-month lock-up period from the date of such capital contributions.

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