CONVERTIBLE PREFERRED SHARES AND SHAREHOLDERS' DEFICIT - Third Company Repurchase (Details) - Third Company Repurchase - USD ($) $ / shares in Units, $ in Millions	1 Months Ended
Aug. 31, 2020	Dec. 31, 2020
Equity, Class of Treasury Stock [Line Items]
Adjustment to additional paid-in capital related to excess fair value paid over carrying amount		$ 10.5
Series C
Equity, Class of Treasury Stock [Line Items]
Number of shares agreed to repurchase	9,656,589
Price per share	$ 1.02
Value of shares agreed to repurchase	$ 9.9
Carrying value of the repurchased convertible preferred shares	$ 20.4

Amount of increase (decrease) in additional paid in capital related to excess fair value paid over carrying amount.

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Represents the number of shares agreed to repurchase.

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Represents the value of shares agreed to repurchase.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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