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Quarterly Results (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Quarterly Results (unaudited)                    
Revenues $ 50 $ 324     $ 54 $ 190 $ 0 $ 363 $ 374 $ 607
Gross Profit (Loss) (7) 123     3 (88) (505) 138 116 (452)
Operating Expense 1,498 1,558 $ 1,660 $ 1,517 1,228 2,269 2,037 2,159 6,233 7,693
Net loss attributed to common stockholders $ (1,318) $ (1,312) $ (1,638) $ (1,490) $ (1,227) $ (2,353) $ (2,290) $ (2,021) $ (5,758) $ (7,891)
Net loss per share - basic $ (0.03) $ (0.03) $ (0.05) $ (0.05) $ (0.04) $ (0.07) $ (0.07) $ (0.07) $ (0.16) $ (0.25)
Net loss per share - fully diluted $ (0.03) $ (0.03) $ (0.05) $ (0.05) $ (0.04) $ (0.07) $ (0.07) $ (0.07) $ (0.16) $ (0.25)