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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Convertible Preferred Stock (Details) - shares shares in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Accounting Policies [Abstract] |  |  |  |
Weighted average convertible preferred stock | 43,750 | 72,019 | 43,750 | 84,135

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