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Balance Sheet Components - Inventory (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Inventory        
Raw materials $ 414,000   $ 448,000 $ 182,000
Work-in-process 498,000   601,000 891,000
Finished goods 872,000   437,000 2,407,000
Total inventory 1,784,000   1,486,000 3,480,000
Write-downs of inventory $ 0 $ 0 $ 358,000 $ 338,000