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STARBOARD INVESTMENT - Senior Secured Notes (Details) - USD ($) |  |  |  |  |  |  |  |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 14, 2022 | Jan. 31, 2022 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Jan. 29, 2021 | Jun. 30, 2020 | Jun. 04, 2020 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Nov. 18, 2019
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of secured debt |  |  |  |  |  |  |  |  | $ 15,000,000 | $ 50,000,000 |  |  |  |
Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity, par or stated value per share |  |  |  |  |  |  |  |  | $ 0.001 |  | $ 0.001 |  |  | $ 0.001
Series A Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, current |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  |  |
Senior Secured Notes | New Notes | Merton |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of secured debt |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Principal amount outstanding |  | $ 165,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Notes | New Notes | Merton | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of secured debt | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount outstanding | $ 115,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Notes | Series A Redeemable Convertible Preferred Stock | Merton |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, current |  |  |  |  |  |  |  |  | $ 3,700,000 |  | 1,338,000 |  |  |
Senior Secured Notes | Securities Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of secured debt |  |  |  |  |  |  |  | $ 115,000,000 |  |  |  |  |  |
Senior Secured Notes | Securities Purchase Agreement | Merton |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate outstanding principal amount |  |  |  |  |  |  | $ 115,000,000 |  |  |  |  |  |  |
Debt instrument, interest rate during period |  |  |  |  |  |  |  |  | 6.00% |  |  |  |  |
Lender fees |  |  |  |  |  |  |  |  | $ 4,600,000 |  |  |  |  |
Senior Secured Notes | Securities Purchase Agreement | New Notes | Merton |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of secured debt |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |
Repayments of secured debt |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |
Principal amount outstanding |  |  |  |  |  |  |  |  | $ 165,000,000 |  | $ 180,000,000 |  |  |
Senior Secured Notes | Securities Purchase Agreement | June 2021 Merton Notes | Merton |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of secured debt |  |  |  | $ 30,000,000 |  |  |  |  |  |  |  |  |  |
Senior Secured Notes | Securities Purchase Agreement | September 2021 Merton Notes | Merton |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of secured debt |  |  | $ 35,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Secured Notes | Securities Purchase Agreement | June 2020 Approved Investment Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of debt |  |  |  |  |  |  |  |  |  |  |  | $ 35,000,000 | $ 80,000,000 |

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