Summary of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) Segment	Dec. 31, 2018 USD ($)	Jan. 01, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Allowance for credit losses related to notes receivable outstanding	$ 0
Intangible assets impairment charges	0
Goodwill impairment charges	573,000	$ 0
Deferred tax assets reduction in valuation allowance	400,000
Payment of contingent consideration	0	2,617,000
Cumulative effect adjustment to accumulated deficit	(273,474,000)	(277,373,000)
Selling, General and Administrative Expenses [Member]
Summary Of Significant Accounting Policies [Line Items]
Advertising and promotion expense	$ 600,000	800,000
ASC 606 [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of reporting segment | Segment	1
Percentage of service revenue that is recognized over a period of time against total revenue	2.00%
Deferred revenue	$ 2,500
Difference Between Revenue Guidance in Effect Before and After Topic 606 [Member] | ASC 606 [Member]
Summary Of Significant Accounting Policies [Line Items]
Cumulative effect adjustment to accumulated deficit			$ 0
NLEX [Member]
Summary Of Significant Accounting Policies [Line Items]
Fair value of liabilities	$ 0	0
Payment of contingent consideration		$ 2,600,000