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STOCKHOLDER'S EQUITY - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	May 01, 2019	Aug. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Class of Stock [Line Items]
Share-based compensation expense			$ 5,903	$ 4,218	$ 11,588	$ 8,843
Unrecognized compensation cost, weighted average period (in years)					2 years 6 months
Common stock, shares authorized (in shares)			2,100,000,000		2,100,000,000
Class A Shares
Class of Stock [Line Items]
Common stock, shares authorized (in shares)			1,000,000,000		1,000,000,000		1,000,000,000
Common stock, par value (in dollars per share)			$ 0.001		$ 0.001		$ 0.001
Class B Shares
Class of Stock [Line Items]
Common stock, shares authorized (in shares)			1,000,000,000		1,000,000,000		1,000,000,000
Common stock, par value (in dollars per share)			$ 0.001		$ 0.001		$ 0.001
Conversion of Class B Shares to Class A Shares (in shares)			(5,433,680)	(145)	(5,587,725)	(6,060)
Preferred Stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)			100,000,000		100,000,000
Common stock, par value (in dollars per share)			$ 0.001		$ 0.001
Special Warrants
Class of Stock [Line Items]
Special warrants, exercise price per share (in dollars per share)	$ 0.001
Special warrants, conversion terms, ownership percentage of common stock (as a percent)	4.99%
Special warrants, conversion terms, ownership percentage of capital stock or voting interests (as a percent)	22.50%
Vesting based on service conditions
Class of Stock [Line Items]
Unrecognized compensation cost			$ 48,700		$ 48,700
Vesting based on performance conditions
Class of Stock [Line Items]
Unrecognized compensation cost			600		600
Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Share-based compensation expense			500		1,000
Award vesting period (in months)		18 months
Corporate Expenses
Class of Stock [Line Items]
Share-based compensation expense			$ 5,900	$ 4,200	$ 11,600	$ 8,800

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