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Fair Value Measurements - Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2022
Apr. 30, 2019
Mar. 31, 2023
Mar. 31, 2022
Sep. 30, 2022
Mar. 31, 2019
Financial assets:            
Other investments     $ 39,220 $ 18,000 $ 24,220  
Carrying Value            
Financial assets:            
Other investments     39,220 18,000 24,220  
Estimated Fair Value            
Financial assets:            
Other investments     39,220 18,000 24,220  
Estimated Fair Value | Level 1            
Financial assets:            
Other investments     0 0 0  
Estimated Fair Value | Level 2            
Financial assets:            
Other investments     0 0 0  
Estimated Fair Value | Level 3            
Financial assets:            
Other investments     $ 39,220 $ 18,000 $ 24,220  
2.89% promissory note receivable due April 2024            
Financial assets:            
Notes receivable, fair value   $ 1,100       $ 1,100
Financial liabilities:            
Interest on note receivable   2.89% 2.89% 2.89% 2.89%  
2.89% promissory note receivable due April 2024 | Carrying Value            
Financial assets:            
Notes receivable, fair value     $ 1,233 $ 1,198 $ 1,215  
2.89% promissory note receivable due April 2024 | Estimated Fair Value            
Financial assets:            
Notes receivable, fair value     1,233 1,198 1,215  
2.89% promissory note receivable due April 2024 | Estimated Fair Value | Level 1            
Financial assets:            
Notes receivable, fair value     0 0 0  
2.89% promissory note receivable due April 2024 | Estimated Fair Value | Level 2            
Financial assets:            
Notes receivable, fair value     0 0 0  
2.89% promissory note receivable due April 2024 | Estimated Fair Value | Level 3            
Financial assets:            
Notes receivable, fair value     $ 1,233 1,198 1,215  
12.00% promissory note receivable from Founders            
Financial assets:            
Notes receivable, fair value $ 15,000          
Financial liabilities:            
Interest on note receivable 12.00%   12.00%      
12.00% promissory note receivable from Founders | Carrying Value            
Financial assets:            
Notes receivable, fair value     $ 15,600      
12.00% promissory note receivable from Founders | Estimated Fair Value            
Financial assets:            
Notes receivable, fair value     15,600      
12.00% promissory note receivable from Founders | Estimated Fair Value | Level 1            
Financial assets:            
Notes receivable, fair value     0      
12.00% promissory note receivable from Founders | Estimated Fair Value | Level 2            
Financial assets:            
Notes receivable, fair value     0      
12.00% promissory note receivable from Founders | Estimated Fair Value | Level 3            
Financial assets:            
Notes receivable, fair value     15,600      
Investments in unconsolidated affiliates | Carrying Value            
Financial assets:            
Investments in unconsolidated affiliates     10,681 42,002 37,733  
Investments in unconsolidated affiliates | Estimated Fair Value            
Financial assets:            
Investments in unconsolidated affiliates     42,917 51,502 40,279  
Investments in unconsolidated affiliates | Estimated Fair Value | Level 1            
Financial assets:            
Investments in unconsolidated affiliates     42,917 44,529 40,279  
Investments in unconsolidated affiliates | Estimated Fair Value | Level 2            
Financial assets:            
Investments in unconsolidated affiliates     0 0 0  
Investments in unconsolidated affiliates | Estimated Fair Value | Level 3            
Financial assets:            
Investments in unconsolidated affiliates     0 6,973 0  
2024 Convertible Notes | Carrying Value            
Financial liabilities:            
Debt instruments, fair value     34,184 142,248 142,575  
2024 Convertible Notes | Estimated Fair Value            
Financial liabilities:            
Debt instruments, fair value     34,389 141,594 157,727  
2024 Convertible Notes | Estimated Fair Value | Level 1            
Financial liabilities:            
Debt instruments, fair value     0 0 0  
2024 Convertible Notes | Estimated Fair Value | Level 2            
Financial liabilities:            
Debt instruments, fair value     34,389 141,594 157,727  
2024 Convertible Notes | Estimated Fair Value | Level 3            
Financial liabilities:            
Debt instruments, fair value     0 0 0  
2025 Convertible Notes | Carrying Value            
Financial liabilities:            
Debt instruments, fair value     102,312 169,920 170,328  
2025 Convertible Notes | Estimated Fair Value            
Financial liabilities:            
Debt instruments, fair value     94,690 153,525 147,488  
2025 Convertible Notes | Estimated Fair Value | Level 1            
Financial liabilities:            
Debt instruments, fair value     0 0 0  
2025 Convertible Notes | Estimated Fair Value | Level 2            
Financial liabilities:            
Debt instruments, fair value     94,690 153,525 147,488  
2025 Convertible Notes | Estimated Fair Value | Level 3            
Financial liabilities:            
Debt instruments, fair value     0 $ 0 $ 0  
2029 Convertible Notes | Carrying Value            
Financial liabilities:            
Debt instruments, fair value     222,791      
2029 Convertible Notes | Estimated Fair Value            
Financial liabilities:            
Debt instruments, fair value     221,529      
2029 Convertible Notes | Estimated Fair Value | Level 1            
Financial liabilities:            
Debt instruments, fair value     0      
2029 Convertible Notes | Estimated Fair Value | Level 2            
Financial liabilities:            
Debt instruments, fair value     221,529      
2029 Convertible Notes | Estimated Fair Value | Level 3            
Financial liabilities:            
Debt instruments, fair value     $ 0