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Revenue (Details 3) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2026
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Telecommunications Services              
Deferred Revenue, Revenue Recognized $ 26,924,000 $ 176,000 $ 1,571,000 $ 4,020,000 $ 6,234,000 $ 8,905,000 $ 6,018,000
Desktop Devices              
Deferred Revenue, Revenue Recognized $ 304,000 $ 0 $ 0 $ 0 $ 0 $ 0 $ 304,000