SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible Assets - Useful Lives (Details)	12 Months Ended
	Dec. 31, 2020
Database
Intangible Assets
Useful life	10 years
Data assets
Intangible Assets
Useful life	4 years
Minimum | Technology
Intangible Assets
Useful life	3 years
Minimum | Trademark and trade names
Intangible Assets
Useful life	3 years
Minimum | Customer relationships
Intangible Assets
Useful life	8 years
Maximum | Technology
Intangible Assets
Useful life	13 years
Maximum | Trademark and trade names
Intangible Assets
Useful life	17 years
Maximum | Customer relationships
Intangible Assets
Useful life	15 years 9 months