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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE - Summary of Major Clients (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Concentration Risk [Line Items]
Percent of total revenue	100.00%	100.00%
Client A | Credit concentration risk | Account receivable and unbilled receivables
Concentration Risk [Line Items]
Percent of total revenue	11.00%		10.00%
Client A | Credit concentration risk | Accounts receivable
Concentration Risk [Line Items]
Percent of total revenue	4.00%		1.00%
Client A | Credit concentration risk | Unbilled receivables
Concentration Risk [Line Items]
Percent of total revenue	15.00%		15.00%

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