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SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Allowance for loan loss | $ 27,700 | $ 169,500 |  |
Accumulated deficit | $ 9,720,270 | $ 10,667,388 | [1] |
Cumulative effect of change in accounting principle for credit losses |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Allowance for loan loss |  |  |  | $ 37,400
Off-balance sheet credit loss, liability |  |  |  | 2,200
Accumulated deficit |  |  |  | $ 39,600
[1] | (1)Derived from the audited consolidated financial statements at December 31, 2020.

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