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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Convertible Preferred Stock (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	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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- Definition

Weighted Average Number of Shares, Convertible Preferred Stock

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