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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Contract Origination Costs, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Incremental costs deferred	$ 2,600	$ 1,800
Period of benefit for amortization	10 years
Amortization of contract costs	$ 800	500
Impairment losses related to the contract origination costs no longer recoverable	100	500
Impairment of goodwill	$ 0	$ 0

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Amount of incremental contract costs deferred during the year.

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Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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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