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Basis of Presentation and Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue from External Customer [Line Items]
Net sales	$ 2,074	$ 3,335	$ 4,711	$ 7,118
Commercial
Revenue from External Customer [Line Items]
Net sales	1,078	1,058	1,991	2,794
MMM products
Revenue from External Customer [Line Items]
Net sales	$ 996	$ 2,277	$ 2,720	$ 4,324

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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