ORGANIZATION AND BUSINESS OPERATIONS - Restructuring and reorganization expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		15 Months Ended	21 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2024	Sep. 30, 2024
Restructuring Expense
Restructuring Charges, Total	$ 2,345	$ 1,383	$ 3,535	$ 4,640
Gain on lease termination				300
Right of use assets terminated				5,600
Lease liabilities terminated				5,900
2023 Restructuring
Restructuring Expense
Employee termination benefits					$ 6,641
Contract termination costs					5,777
Payments for restructuring			5,700
Restructuring costs remain accrued	1,300		1,300			$ 1,300
Restructuring Charges, Total			1,200	$ 4,600	12,418
Restructure costs paid			5,700
Total restructure costs paid						11,400
Gain on lease termination						300
Right of use assets terminated						5,600
Lease liabilities terminated						5,900
2024 Reorganization
Restructuring Expense
Contract termination costs	2,300
Payments for restructuring	700
Restructuring costs remain accrued	1,600		$ 1,600			$ 1,600
Restructure costs paid	$ 700
US Telecom | 2023 Restructuring
Restructuring Expense
Employee termination benefits					1,960
Contract termination costs					5,777
Restructuring Charges, Total					7,737
International Telecom | 2023 Restructuring
Restructuring Expense
Employee termination benefits					4,681
Restructuring Charges, Total					$ 4,681