SUPPLEMENTAL FINANCIAL INFORMATION - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue, Major Customer [Line Items]
Revenue	$ 37,928	$ 12,515	$ 3,184
Accounts Receivable, after Allowance for Credit Loss	406	92
Sales Revenue, Net | Customer Concentration Risk | Customer 1
Revenue, Major Customer [Line Items]
Revenue	18,470	0	0
Sales Revenue, Net | Customer Concentration Risk | Customer 2
Revenue, Major Customer [Line Items]
Revenue	10,472	0	0
Sales Revenue, Net | Customer Concentration Risk | Customer 3
Revenue, Major Customer [Line Items]
Revenue	4,335	0	0
Sales Revenue, Net | Customer Concentration Risk | Customer 4
Revenue, Major Customer [Line Items]
Revenue	2,848	2,592	1,385
Sales Revenue, Net | Customer Concentration Risk | Customer 5
Revenue, Major Customer [Line Items]
Revenue	866	8,778	0
Sales Revenue, Net | Customer Concentration Risk | Customer 6
Revenue, Major Customer [Line Items]
Revenue	0	445	1,571
Sales Revenue, Net | United States | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenue	34,514	9,473	1,721
Sales Revenue, Net | ESTONIA | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenue	2,848	2,592	1,385
Sales Revenue, Net | Other | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenue	566	450	$ 78
Accounts Receivable Benchmark | Customer Concentration Risk | Customer 1
Revenue, Major Customer [Line Items]
Accounts Receivable, after Allowance for Credit Loss	291	0
Accounts Receivable Benchmark | United States | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Accounts Receivable, after Allowance for Credit Loss	115	92
Accounts Receivable Benchmark | ESTONIA | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Accounts Receivable, after Allowance for Credit Loss	$ 291	$ 0