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Revenue, Contract balances (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Revenue [Abstract]    
Revenue recognized $ 700  
Contract liabilities [Abstract]    
Unbilled receivables, current 59 $ 106
Unbilled receivables, net of current portion 10 32
Customer pre-payments (339) (164)
Deferred revenue, current (1,162) (1,107)
Deferred revenue, net of current portion (333) (246)
Total net contract liabilities $ (1,765) $ (1,379)