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FAIR VALUE OF FINANCIAL INSTRUMENTS - Additional Information (Details) - USD ($)	Jun. 30, 2021	Mar. 18, 2021	Dec. 31, 2020
RTI warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrants repurchase maximum threshold	$ 15,000,000.0
Level 3 | Private warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Aggregate value	2,899,000	$ 4,604,000
Level 3 | RTI warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Aggregate value	$ 15,000,000		$ 0

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- Definition

Warrants under Agreements to Repurchase, Maximum Threshold, Fair Value Disclosure

+ References

No definition available.

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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.

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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 http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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