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REVENUE - Receivables and contract liabilities (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Jan. 01, 2023
REVENUE      
Receivables, which are included in grants and accounts receivable $ 4,426,890 $ 3,846,271 $ 3,822,452
Contract liabilities, which are included in accrued expenses and other current liabilities $ 596,042 $ 1,577,141