BASIS OF FINANCIAL STATEMENT PREPARATION (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025 segment country	Sep. 30, 2024	Dec. 31, 2024
Concentration Risk [Line Items]
Number of countries with primary office locations | country			5
Number of operating segments			1
Number of reportable segments			1
Customer one | Accounts receivable and unbilled services | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk, percentage			23.40%
Customer one | Revenue | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk, percentage	19.80%	15.10%	18.30%	14.20%
Pharmaceutical company one | Accounts receivable and unbilled services | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk, percentage					22.20%
Pharmaceutical company two | Accounts receivable and unbilled services | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk, percentage					13.80%
Customer two | Revenue | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk, percentage				10.40%