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Summary of Significant Accounting Policies (Narrative) (Details) | 12 Months Ended |
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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 |

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