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Quarterly Financial Information (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, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]                              
Revenue $ 0 $ 0 $ 314 $ 350 $ 557 $ 718 $ 746 $ 479 $ 395 $ 639 $ 587 $ 1,469 $ 664 $ 2,500 $ 3,090
Gross profit (33) (45) 296 346 509 728 777 484 395 639 588 70 564 2,498 1,692
Net loss $ (13,475) $ (12,851) $ (13,597) $ (13,168) $ (12,625) $ (9,382) $ (14,962) $ (6,231) $ (3,570) $ (2,826) $ (2,304) $ (4,934) $ (53,091) $ (43,200) $ (13,634)
Net loss per share, basic $ (0.08) $ (0.08) $ (0.08) $ (0.08) $ (0.08) $ (0.06) $ (0.09) $ (0.04) $ (0.02) $ (0.02) $ (0.02) $ (0.04) $ (0.32) $ (0.27) $ (0.1)
Net loss per share, diluted $ (0.08) $ (0.08) $ (0.08) $ (0.08) $ (0.08) $ (0.06) $ (0.09) $ (0.04) $ (0.02) $ (0.02) $ (0.02) $ (0.04) $ (0.32) $ (0.27) $ (0.1)