Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary Of Significant Accounting Policies [Line Items]
Accumulated deficit		$ (281,124,000)	$ (280,875,000)
Working capital deficit		5,600,000
Cash flows from operating activities		1,182,000	3,918,000
Intangible assets impairment charges		0
Goodwill impairment charges		$ 0
Corporate income tax rate		35.00%
Selling, General and Administrative Expenses [Member]
Summary Of Significant Accounting Policies [Line Items]
Advertising and promotion expense		$ 500,000	$ 400,000
NLEX [Member]
Summary Of Significant Accounting Policies [Line Items]
Earn-out maximum amount		5,000,000
Remaining Earn-Out Provision Payment [Member] | NLEX [Member] | David Ludwig [Member]
Summary Of Significant Accounting Policies [Line Items]
Adjustment to contingent consideration liability to fair value of remaining earn-out payment, maximum amount		$ 2,800,000
Scenario, Forecast [Member]
Summary Of Significant Accounting Policies [Line Items]
Corporate income tax rate	21.00%