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FAIR VALUE MEASUREMENTS - Changes to Fair Value Measurement Level 3 (Details) - Liabilities - Level 3 - Fair Value, Recurring - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Derivative liability, beginning balance | $ 126,117 | $ 79,069
Issuance of series warrants |  | 6,640
Remeasurement to fair value | (28,098) | 198,909
Derivative liability, ending balance | 98,019 | 284,618
Series A Warrant Liabilities |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Derivative liability, beginning balance | 11,291 | 0
Issuance of series warrants |  | 6,640
Remeasurement to fair value | (896) | 11,603
Derivative liability, ending balance | 10,395 | 18,243
Series A Embedded Derivative Liabilities |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Derivative liability, beginning balance | 18,448 | 26,728
Issuance of series warrants |  | 0
Remeasurement to fair value | (3,942) | 13,691
Derivative liability, ending balance | 14,506 | 40,419
Series B Warrant Liabilities |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Derivative liability, beginning balance | 96,378 | 52,341
Issuance of series warrants |  | 0
Remeasurement to fair value | (23,260) | 173,615
Derivative liability, ending balance | $ 73,118 | $ 225,956

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- Definition Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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