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Quarterly Results (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Quarterly Results (unaudited)                    
Revenues $ 590 $ 1,859 $ 45 $ 1,102 $ 1,274 $ 85 $ 150 $ 894 $ 3,596 $ 2,403
Gross profit 88 551 42 437 558 24 129 106 1,118 817
Operating expense 1,754 1,984 2,179 1,689 1,709 1,521 1,758 1,810 7,606 6,798
Net loss $ (1,164) $ (1,155) $ (1,872) $ (1,108) $ (955) $ (1,332) $ (1,478) $ (1,429) $ (5,299) $ (5,194)
Net loss per share - basic (in dollar per share) $ (0.02) $ (0.02) $ (0.04) $ (0.03) $ (0.02) $ (0.03) $ (0.04) $ (0.04) $ (0.11) $ (0.13)
Net loss per share - fully diluted (in dollar per share) $ (0.02) $ (0.02) $ (0.04) $ (0.03) $ (0.02) $ (0.03) $ (0.04) $ (0.04) $ (0.11) $ (0.13)