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INVESTMENTS - Summary of Investments (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Jun. 30, 2021 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |
Investments |  | $ 36,472,000 | $ 37,671,000
Loss from changes in fair value of investments | $ 1,400,000 |  |
Other equity investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments |  | 36,472,000 | 37,671,000
Redeemable preferred shares |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Available-for-sale securities |  | 0 | 0
Fair value option investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments |  | $ 0 | $ 0
Minimum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Available for sale securities, percent ownership of voting stock |  | 19.00% | 19.00%
Minimum | Other equity investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, percent ownership of voting stock |  | 1.00% | 1.00%
Minimum | Fair value option investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, percent ownership of voting stock |  | 10.00% | 10.00%
Maximum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Available for sale securities, percent ownership of voting stock |  | 25.00% | 25.00%
Maximum | Other equity investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, percent ownership of voting stock |  | 19.00% | 19.00%
Maximum | Fair value option investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, percent ownership of voting stock |  | 19.00% | 19.00%

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