STOCKHOLDERS’ EQUITY - Narrative (Details)		1 Months Ended				3 Months Ended	6 Months Ended	9 Months Ended
	Jan. 19, 2022 $ / shares shares	Jul. 31, 2022 USD ($) $ / shares shares	Mar. 31, 2022 shares	Feb. 28, 2022 shares	Jul. 31, 2021 USD ($)	Sep. 30, 2022 USD ($) vote $ / shares shares	Sep. 30, 2022 USD ($) vote $ / shares shares	Sep. 30, 2022 USD ($) vote $ / shares shares	Aug. 19, 2022	Jun. 08, 2022 shares	Jan. 18, 2022 shares	Dec. 31, 2021 USD ($) $ / shares shares	Jan. 31, 2021 $ / shares shares	Mar. 31, 2020 $ / shares shares
Class of Stock [Line Items]
Common stock, shares authorized (in shares)						10,000,000,000	10,000,000,000	10,000,000,000				10,000,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.00001					$ 0.0001	$ 0.0001	$ 0.0001				$ 0.0001
Voting rights per share | vote						1	1	1
Warrants outstanding (in shares)						14,900,000	14,900,000	14,900,000
Exercise price of warrants (in dollars per share) | $ / shares						$ 11.50	$ 11.50	$ 11.50
Common stock, exchange ratio	1.6001528688
Issuances of common stock | $								$ 12,674,000
Convertible debt, conversion price (in dollars per share) | $ / shares	$ 8.00
SPAC vesting shares (in shares)											1,700,000
Issuances of common stock- vendor settlement (in shares)			1,600,000
Number of consecutive days					30 days
Lockup period					180 days
Vendor liability, contractual amount | $					$ 21,300,000
Vendor liability, changes in fair value | $						$ 100,000		9,500,000
Vendor liability, fair value | $						$ 18,100,000	$ 18,100,000	$ 18,100,000
Number of common shares available for grant, outstanding (in shares)						81,000,000	81,000,000	81,000,000
Common shares purchased for award (in shares)						27,000,000	27,000,000	27,000,000
Weighted average price of shares purchased (in shares) | $ / shares						$ 8.9	$ 8.9	$ 8.9
Options remaining contractual term								3 years 3 months 18 days
Option, unrecognized share-based compensation expense | $						$ 97,800,000	$ 97,800,000	$ 97,800,000
B. Riley | Common Stock Equity Line Of Credit
Class of Stock [Line Items]
Common stock, par value (in dollars per share) | $ / shares		$ 0.0001
Sale of stock, authorized amount | $		$ 100,000,000
Purchase share volume maximum calculation, denominator		0.20
Percent of closing sale price of the common stock		75.00%
Discount rate		3.00%
Stock purchase agreement, authorized number of shares (in shares)		70,300,000
Percent of common stock outstanding		19.99%
Threshold purchase price (in dollars per share) | $ / shares		$ 1.75
Threshold consecutive trading days		5 days
Threshold ownership percentage of outstanding common stock		4.99%
Equity line of credit, threshold automatic termination period		24 months
Equity line of credit, threshold aggregate gross purchase price | $		$ 100,000,000
Equity line of credit, threshold trading days		30 days
Equity line of credit, termination terms, prior written notice term		5 days
Reimbursement of legal fees | $		$ 100,000
Sale of stock, number of shares issued (in shares)						7,300,000		7,300,000
Sale of stock, sale price | $						$ 12,800,000		$ 12,800,000
Sale of stock, consideration received on transaction | $						11,700,000		11,700,000
Sale of stock, proceeds due from counterparty | $						1,100,000		1,100,000
Equity line of credit, discount | $						300,000	300,000	300,000
Convertible Notes
Class of Stock [Line Items]
Note payable face amount | $												$ 514,800,000
Paid-in-kind interest | $							31,000,000
Convertible debt, conversion price (in dollars per share) | $ / shares	$ 8.00
Bridge Loan | Amended B. Riley Bridge Notes
Class of Stock [Line Items]
Bridge loan, additional payments required, percentage of amounts drawn under equity line of credit									25.00%
Debt instrument, additional payments required | $						$ 2,900,000	$ 2,900,000	2,900,000
Conversion of Convertible Notes
Class of Stock [Line Items]
Debt conversion, converted amount | $								$ 1,600,000
Debt conversion, converted instrument, shares issued (in shares)								200,000
Conversion of XPDI's Common Stock to New Core Common Stock
Class of Stock [Line Items]
Recapitalization transaction, conversion ratio											1
Common Stock
Class of Stock [Line Items]
Issuances of common stock- Merger with XPDI (in shares)	30,800,000
Equity line of credit, shares remaining for issuance (in shares)						63,000,000	63,000,000	63,000,000
Common Stock, Commitment Shares | B. Riley | Common Stock Equity Line Of Credit
Class of Stock [Line Items]
Issuance of common stock (in shares)		600,000
Issuances of common stock | $		$ 1,100,000
Stock options
Class of Stock [Line Items]
Period for recognition								3 years 2 months 12 days
Restricted Stock Units and Restricted Awards
Class of Stock [Line Items]
Nonvested RSAs and RSUs (in shares)						54,000,000	54,000,000	54,000,000
Period for recognition								3 years 3 months 18 days
RSUs and RSAs, unrecognized share-based compensation expense | $						$ 126,200,000	$ 126,200,000	$ 126,200,000
Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Restricted stock units granted in period (in shares)						13,100,000		27,100,000
Restricted stock units granted (in dollars per share) | $ / shares						$ 3.08		$ 2.93
2018 Omnibus Incentive Plan | Minimum
Class of Stock [Line Items]
Share-based compensation, award vesting period								1 year
2018 Omnibus Incentive Plan | Maximum | Stock options
Class of Stock [Line Items]
Share-based compensation, award expiration period								10 years
2021 Equity Incentive Plan
Class of Stock [Line Items]
Share-based compensation, number of shares authorized (in shares)						45,000,000	45,000,000	45,000,000
Number of common shares available for grant (in shares)						30,100,000	30,100,000	30,100,000
2021 Equity Incentive Plan | Stock options
Class of Stock [Line Items]
Share-based compensation, award expiration period								10 years
2021 Equity Incentive Plan | Minimum
Class of Stock [Line Items]
Share-based compensation, award vesting period								1 year
Amendment to 2018 Omnibus Incentive Plan | Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Number of common shares to be net settled (in shares)										42,000,000
Number of shares to be forfeited and cancelled (in shares)										15,000,000
Stockholder Loan Warrants
Class of Stock [Line Items]
Warrants outstanding (in shares)													200,000
Exercise price of warrants (in dollars per share) | $ / shares													$ 4.21
Public Warrants
Class of Stock [Line Items]
Warrants outstanding (in shares)						8,600,000	8,600,000	8,600,000
Public Warrants | XPDI
Class of Stock [Line Items]
Warrants outstanding (in shares)											8,600,000
Private Placement Warrants
Class of Stock [Line Items]
Warrants outstanding (in shares)						6,300,000	6,300,000	6,300,000
Private Placement Warrants | XPDI
Class of Stock [Line Items]
Warrants outstanding (in shares)											6,300,000
Executive Notes Warrants
Class of Stock [Line Items]
Warrants outstanding (in shares)														6,400,000
Exercise price of warrants (in dollars per share) | $ / shares														$ 0.84
Class of warrant or right, warrants exercised				3,200,000
Issuance of common stock - exercise of warrants (in shares)				2,900,000
Shares withheld for tax withholding obligation (in shares)			300,000
Service Providers Warrants
Class of Stock [Line Items]
Warrants outstanding (in shares)														200,000
Exercise price of warrants (in dollars per share) | $ / shares														$ 4.27
Class of warrant or right, warrants exercised				200,000
Issuance of common stock - exercise of warrants (in shares)				100,000