SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible Assets - Useful Lives (Details)	12 Months Ended
	Dec. 31, 2019
Database
Intangible Assets
Useful life	10 years
Minimum | Proprietary software technologies
Intangible Assets
Useful life	3 years
Minimum | Trademark
Intangible Assets
Useful life	3 years
Minimum | Customer Relationships
Intangible Assets
Useful life	8 years
Maximum | Proprietary software technologies
Intangible Assets
Useful life	13 years
Maximum | Trademark
Intangible Assets
Useful life	17 years
Maximum | Customer Relationships
Intangible Assets
Useful life	15 years 9 months