RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE - Summary of Major Clients (Details)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Client A	100.00%	100.00%	100.00%
Client A \| Credit concentration risk \| Accounts receivable
Concentration Risk [Line Items]
Client A	10.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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