GENERAL AND BASIS OF PRESENTATION - Concentration of credit risk (Details) $ in Thousands	1 Months Ended	9 Months Ended	12 Months Ended
	Oct. 31, 2025 USD ($)	Sep. 30, 2025 USD ($) financialInstitution	Dec. 31, 2024 USD ($) financialInstitution
Concentration Risk [Line Items]
Cash, FDIC insured amount		$ 39,300	$ 31,200
Number of financial Institutions, cash investment | financialInstitution		10	10
Cash, uninsured amount		$ 66,100	$ 73,900
Trade allowance for credit losses		150,066	164,050
Total receivables | Customer Concentration Risk
Concentration Risk [Line Items]
Financing receivable, after allowance for credit loss		$ 81,300	$ 99,700
Primary customers | Accounts receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk (in percentage)		56.00%	57.00%
Kenya Power and Lighting Co. Ltd. ("KPLC")
Concentration Risk [Line Items]
Accounts receivable, past due		$ 36,300
Kenya Power and Lighting Co. Ltd. ("KPLC") | Subsequent Event
Concentration Risk [Line Items]
Proceeds over due accounts receivable	$ 11,000
ENEE
Concentration Risk [Line Items]
Accounts receivable, past due		16,000
ENEE | Subsequent Event
Concentration Risk [Line Items]
Proceeds over due accounts receivable	$ 1,000
Non-US
Concentration Risk [Line Items]
Trade allowance for credit losses		$ 99,800	$ 105,200