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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) | 12 Months Ended
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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% |  |

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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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