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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Convertible Preferred Stock (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	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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- Definition

Weighted Average Number of Shares, Convertible Preferred Stock

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