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FAIR VALUE MEASUREMENTS - Schedule of fair value hierarchy for liabilities measured at fair value on a recurring basis (Details) - USD ($) | Dec. 31, 2020 | Jun. 30, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Warrant liabilities | $ 53,005,335 | $ 53,005,335
FPA liability | $ 10,654,540 | 10,654,540
Public Warrants |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Warrant liabilities |  | 35,880,000
Private Placement Warrants |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Warrant liabilities |  | 17,125,335
Fair Value, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Warrant liabilities |  | 35,880,000
Fair Value, Recurring | Level 1 | Public Warrants |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Warrant liabilities |  | 35,880,000
Fair Value, Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Warrant liabilities |  | 17,125,335
FPA liability |  | 10,654,540
Fair Value, Recurring | Level 3 | Private Placement Warrants |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Warrant liabilities |  | $ 17,125,335

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- Definition Amount of Forward Purchase Agreement (FPA) liability. + References No definition available. + Details
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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 The fair value of shares that would be issued, determined under the conditions specified in the contract if the settlement were to occur at the reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109262807&loc=d3e22047-110879 + Details
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