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STOCKHOLDER'S EQUITY - Common Stock and Special Warrants (Details) - $ / shares	Jun. 30, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	2,100,000,000
Common stock, shares issued (in shares)	147,263,215
Class A Common Stock
Class of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	118,261,575	64,726,864
Class B Common Stock
Class of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	23,636,512	6,886,925
Special Warrants
Class of Stock [Line Items]
Common stock, shares issued (in shares)	5,365,128	74,835,899

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Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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