STOCKHOLDERS’ EQUITY (DEFICIT) - Narrative (Details) $ / shares in Units, $ in Thousands			1 Months Ended		2 Months Ended	3 Months Ended	9 Months Ended
	Oct. 29, 2021 $ / shares shares	Jul. 23, 2021 $ / shares shares	Oct. 29, 2021 $ / shares shares	Feb. 28, 2021 USD ($) $ / shares	Sep. 30, 2021 vote $ / shares shares	Sep. 30, 2021 USD ($) vote $ / shares shares	Sep. 30, 2021 USD ($) vote $ / shares shares	Sep. 30, 2020 USD ($)	Oct. 08, 2021 $ / shares	Sep. 08, 2021 $ / shares	Jul. 22, 2021 shares	Dec. 31, 2020 $ / shares shares	Sep. 30, 2017 $ / shares shares
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)					10,000,000	10,000,000	10,000,000					0
Preferred stock, par value (in dollars per share) | $ / shares					$ 0.0001	$ 0.0001	$ 0.0001					$ 0.0001
Preferred stock, shares issued (in shares)					0	0	0					0
Preferred stock, shares outstanding (in shares)					0	0	0					0
Reverse recapitalization, shares issued (in shares)		425,395,023
Common stock, shares outstanding (in shares)		1,618,621,534			1,641,642,816	1,641,642,816	1,641,642,816				451,295,965	28,791,702
Common stock, par value (in dollars per share) | $ / shares		$ 0.0001			$ 0.0001	$ 0.0001	$ 0.0001					$ 0.0001
Number of votes allowed per share | vote					1	1	1
Number of warrants (in shares)		85,750,000											2
Warrant exercise price (in dollars per share) | $ / shares		$ 11.50		$ 1.94									$ 1.94
Warrants exercised (in shares)						32,082,532	32,082,532
Warrants exercised, cashless (in shares)						17,015,311	17,015,311
Proceeds from the exercise of public warrants | $				$ 3,000		$ 173,300	$ 173,273	$ 0
Warrant, redemption price (in dollars per share) | $ / shares										$ 0.01
Public warrants to purchase common stock
Class of Stock [Line Items]
Number of warrants (in shares)		41,400,000			9,317,468	9,317,468	9,317,468
Warrants exercised (in shares)					32,082,532
Public warrants to purchase common stock | Subsequent Event
Class of Stock [Line Items]
Warrants exercised (in shares)			8,951,665
Warrants exercised, cashless (in shares)	365,803
Warrant, redemption price (in dollars per share) | $ / shares	$ 0.01		$ 0.01						$ 0.01
Legacy Preferred Shareholders
Class of Stock [Line Items]
Stock converted, after exchange ratio (in shares)		1,155,909,367