Summary of Significant Accounting Policies - Concentration Risk (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Concentration Risk [Line Items]
Prepaid Supplies	$ 0.7	$ 0.8
Total Expenditures | Supplier Concentration Risk | Offshore Supplier
Concentration Risk [Line Items]
Concentration risk	29.00%	21.00%
Total Expenditures | Supplier Concentration Risk | Domestic Supplier
Concentration Risk [Line Items]
Concentration risk		12.00%
Accounts Payable | Supplier Concentration Risk | Offshore Supplier
Concentration Risk [Line Items]
Concentration risk	60.00%	44.00%
Two Customers | Accounts receivable | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk	43.00%
Two Customers | Net sales | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk		62.00%
Distributor To The U.S. Navy | Accounts receivable | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk	30.00%	28.00%
Regional Commercial Lighting Retrofit Company | Accounts receivable | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk	13.00%
Distributor To U.S. Navy Combined With Sales To Shipbuilders | Net sales | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk	38.00%	53.00%
Distributor To The U.S. Department Of Defense | Accounts receivable | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk	20.00%
Shipbuilder For U.S. Navy | Accounts receivable | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk	36.00%	21.00%