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Summary of Significant Accounting Policies (Narrative) (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2018 USD ($) customer	Jun. 30, 2018 USD ($) item	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) customer item	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Accounting Policies [Line Items]
Total intangible amortization expense	$ 13,000		$ 27,000	$ 13,000	$ 27,000
Standard product warranty period				1 year
Number of products, exiting buisness associated with \| item		2
Impairment of Consumer Night Vision Business inventory		$ 2,700,000		$ 2,690,000
Other accrued expenses	$ 1,909,000			1,909,000		$ 719,000
Impairment of Consumer Night Vision Business tooling		100,000		$ 76,000
Warrants [Member] \| Measurement Input, Expected Dividend Rate [Member]
Accounting Policies [Line Items]
Measurement input	0			0
Minimum [Member] \| Warrants [Member]
Accounting Policies [Line Items]
Expected term	3 years 8 months 12 days			3 years 8 months 12 days
Minimum [Member] \| Warrants [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Accounting Policies [Line Items]
Measurement input	2.86			2.86
Minimum [Member] \| Warrants [Member] \| Measurement Input, Price Volatility [Member]
Accounting Policies [Line Items]
Measurement input	47.5			47.5
Maximum [Member] \| Warrants [Member]
Accounting Policies [Line Items]
Expected term	4 years 3 months 18 days			4 years 3 months 18 days
Maximum [Member] \| Warrants [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Accounting Policies [Line Items]
Measurement input	2.87			2.87
Maximum [Member] \| Warrants [Member] \| Measurement Input, Price Volatility [Member]
Accounting Policies [Line Items]
Measurement input	48.0			48.0
Contract Manufacturer [Member]
Accounting Policies [Line Items]
Other accrued expenses		$ 1,400,000
Revenues [Member] \| Customer Concentration Risk [Member]
Accounting Policies [Line Items]
Number of customers \| customer	1
Concentration risk percentage	100.00%		100.00%	100.00%	100.00%
Revenues [Member] \| Customer Concentration Risk [Member] \| Customer One [Member]
Accounting Policies [Line Items]
Concentration risk percentage	12.00%
Cost of Goods, Product Line [Member] \| Supplier Concentration Risk [Member]
Accounting Policies [Line Items]
Number of suppliers \| item				2
Accounts Receivable [Member] \| Customer Concentration Risk [Member]
Accounting Policies [Line Items]
Number of customers \| customer				1
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Customer One [Member]
Accounting Policies [Line Items]
Concentration risk percentage				14.00%