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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE - Summary of Major Clients (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
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     11.00%