CUSTOMER CONTRACTS - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Unbilled contracts receivable	$ 45.0	$ 46.1
Sales allowance, billing-related adjustments	$ 0.7	$ 0.8
Major Customer \| Revenue Benchmark \| Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	13.00%

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.

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