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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE - Summary of Major Clients (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Concentration Risk [Line Items]
Percent of total revenue	100.00%	100.00%	100.00%	100.00%
Client A | Credit concentration risk | Accounts receivable
Concentration Risk [Line Items]
Percent of total revenue			12.00%

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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.

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