REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Total revenue	$ 15,001	$ 2,465
Germany
Disaggregation of Revenue [Line Items]
Total revenue	12,804	723
United States
Disaggregation of Revenue [Line Items]
Total revenue	497	512
Japan
Disaggregation of Revenue [Line Items]
Total revenue	482	325
Canada
Disaggregation of Revenue [Line Items]
Total revenue	304	195
Other
Disaggregation of Revenue [Line Items]
Total revenue	915	710
Revenue recognized over time
Disaggregation of Revenue [Line Items]
Total revenue	2,337	2,405
Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	12,664	60
System sales
Disaggregation of Revenue [Line Items]
Total revenue	12,647	0
QCaaS
Disaggregation of Revenue [Line Items]
Total revenue	1,533	1,692
Professional services
Disaggregation of Revenue [Line Items]
Total revenue	777	639
Other revenue
Disaggregation of Revenue [Line Items]
Total revenue	$ 44	$ 134