Balance Sheets Details - Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Inventory Components
Raw materials	$ 49	$ 77
Work-in-process	77	82
Finished goods	958	805
Inventories	1,084	964
Inventory reserves	$ 1,500	$ 1,500

Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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