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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