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EQUITY SECURITIES PORTFOLIO INVESTMENT - Narrative (Details) £ in Thousands, $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 03, 2020 USD ($) | Apr. 03, 2020 GBP (£) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 GBP (£) | Apr. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Oct. 13, 2021 USD ($) | Dec. 03, 2020
Offsetting Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of investment |  |  | $ 246,484 |  |  |  |  | $ 361,778 |  |
Earnings on equity investment in joint venture |  |  | 0 | $ 2,730 |  |  |  |  |  |
Interest income, other |  |  | 78 |  |  |  |  |  |  |
Notes receivable, related parties |  |  |  |  |  |  |  |  | $ 4,000 |
Subsequent Event | MalinJ1 |  |  |  |  |  |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Milestone payment |  |  |  |  |  |  | $ 40,000 |  |  |
Deferred milestone payment |  |  |  |  |  |  | $ 25,600 |  |  |
Interest accrual percentage |  |  |  |  |  |  | 8.50% |  |  |
Other Noncurrent Assets |  |  |  |  |  |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Notes receivable, related parties |  |  | $ 4,000 |  |  |  |  | 4,000 |  |
Unsecured Debt |  |  |  |  |  |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 8.00% |
Arix |  |  |  |  |  |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment ownership |  |  | 21.00% |  |  |  |  |  |  |
Fair value of investment |  |  | $ 41,700 |  |  |  |  |  |  |
MalinJ1 |  |  |  |  |  |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment ownership |  |  | 41.00% |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  | 63.90%
Earnings on equity investment in joint venture |  |  | $ 0 | $ 2,700 |  |  |  |  |  |
MalinJ1 | Subsequent Event |  |  |  |  |  |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Interest accrual percentage |  |  |  |  |  |  | 8.50% |  |  |
Equity Securities |  |  |  |  |  |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Investment at fair value |  |  | $ 163,700 |  |  |  |  | $ 343,100 |  |
Option Agreement | Portfolio Companies |  |  |  |  |  |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to acquire investments | $ 277,500 | £ 223,900 |  |  |  |  |  |  |  |
Net gain on prepaid investment |  |  |  |  | $ 2,800 |  |  |  |  |
Option Agreement | Portfolio Companies | United Kingdom, Pounds |  |  |  |  |  |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Return on prepayment | £ |  |  |  |  |  | £ 4,500 |  |  |  |
Proceeds from sale of debt securities | £ |  |  |  |  |  | £ 33 |  |  |  |

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