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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Certain Risks and Concentrations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Concentration Risk [Line Items] |  |  |  |  |
Prepayments to vendors | $ 20 |  | $ 20 |  | $ 356
Three Customers | Revenue | Customer concentration risk |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage | 74.00% |  |  |  |
Three Customers | Accounts receivable | Customer concentration risk |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 98.00% |  | 88.00%
Distributor to the U.S. Navy | Revenue | Customer concentration risk |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage | 13.00% |  | 18.00% |  |
Distributor to the U.S. Navy | Accounts receivable | Customer concentration risk |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 13.00% |  | 52.00%
Two Customers | Revenue | Customer concentration risk |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage | 61.00% | 54.00% |  | 40.00% |
Four Customers | Revenue | Customer concentration risk |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 76.00% |  |
Commercial Customer Accounts | Revenue | Customer concentration risk |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 46.00% |  |
Shipbuilder for U.S. Navy | Revenue | Customer concentration risk |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 12.00% |  |
Shipbuilder for U.S. Navy | Accounts receivable | Customer concentration risk |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 18.00% |  | 15.00%
One Customer | Accounts receivable | Customer concentration risk |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 67.00% |  |
Distributor to the U.S. Department of Defense Accounted | Accounts receivable | Customer concentration risk |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  |  |  | 21.00%

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