Basis of Presentation and Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue from External Customer [Line Items]
Net sales	$ 3,335	$ 3,082	$ 7,118	$ 6,259
Commercial
Revenue from External Customer [Line Items]
Net sales	1,058	2,131	2,794	4,114
MMM products
Revenue from External Customer [Line Items]
Net sales	$ 2,277	$ 951	$ 4,324	$ 2,145