SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill (Details)	9 Months Ended
Sep. 30, 2021 USD ($)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Goodwill, Impairment Loss	$ 0

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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