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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Convertible Preferred Stock (Details) - shares shares in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Accounting Policies [Abstract] |  |  |  |
Weighted Average Number of Shares, Preferred Stock (in shares) | 43,750 | 43,750 | 43,750 | 70,575

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