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FAIR VALUE MEASUREMENTS - Fair value of warrant liabilities (Details) - USD ($) |  |  |  | 2 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 02, 2020 | Oct. 12, 2020 | Jul. 01, 2019 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Fair value as of beginning period |  |  |  |  |  |  | $ 56,360,000
Initial measurement |  |  | $ 38,110,000 |  |  |  |
Change in valuation inputs or other assumptions |  |  |  |  |  | $ 18,250,000 | 21,498,000
Fair value as of ending period |  |  |  | $ 77,858,000 | $ 77,858,000 | 56,360,000 | 77,858,000
Private Placement Warrants |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Fair value as of beginning period |  |  |  |  |  |  | 23,700,000
Initial measurement |  |  | 15,800,000 |  |  |  |
Change in valuation inputs or other assumptions |  |  |  |  |  | 7,900,000 | 8,848,000
Fair value as of ending period |  |  |  | 32,548,000 | 32,548,000 | 23,700,000 | 32,548,000
Public Warrants |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Fair value as of beginning period |  |  |  |  |  |  | 32,660,000
Initial measurement |  |  | $ 22,310,000 |  |  |  |
Change in valuation inputs or other assumptions |  |  |  |  |  | 10,350,000 | 12,650,000
Fair value as of ending period |  |  |  | 45,310,000 | 45,310,000 | $ 32,660,000 | 45,310,000
Prosus Agreement Liability |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Initial measurement |  | $ 45,045,478 |  |  |  |  |
Change in valuation inputs or other assumptions |  |  |  |  | 5,432,712 |  |
Fair value as of ending period |  |  |  | 50,481,190 | 50,481,190 |  | 50,481,190
Conversion Option Liabilities |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Initial measurement | $ 1,493,877 |  |  |  |  |  |
Change in valuation inputs or other assumptions |  |  |  | 110,482 |  |  |
Fair value as of ending period |  |  |  | $ 1,604,359 | $ 1,604,359 |  | $ 1,604,359

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- Definition Initial Classification of Warrant Liability. + References No definition available. + Details
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Balance Type: | debit
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- Definition 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. + References No definition available. + Details
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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 https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Fair value 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 https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Details
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