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Summary of Significant Accounting Policies - Schedule of Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Raw materials	$ 171	$ 160
Work-in-process	560	440
Finished goods	62	44
Inventory	793	644
Inventory reserve	(255)	(255)
Total inventory, net of reserve	$ 538	$ 389

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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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