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Summary of Significant Accounting Policies (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) Segment | Dec. 31, 2019 USD ($)
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 | 0 | $ 573,000
Deferred tax assets | $ 4,402,000 | $ 372,000
Percentage of revenue specific to customer from net revenue | 10.00% | 14.00%
Selling, General and Administrative Expenses [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Advertising and promotion expense | $ 400,000 | $ 600,000
ASC 606 [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Number of reporting segment | Segment | 2 |
Deferred revenue | $ 17,000 |
ASC 606 [Member] | Maximum [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Percentage of service revenue that is recognized over a period of time against total revenue | 1.00% |

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