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Summary of Significant Accounting Policies (Narrative) (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 | Sep. 30, 2021 USD ($) Segment | Sep. 30, 2020
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Percentage of revenue specific to customer from net revenue | 6.00% | 8.00% | 9.00% | 12.00%
ASC 606 [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of reporting segment | Segment |  |  | 2 |
Deferred revenue | $ | $ 104,000 |  | $ 104,000 |
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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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 + Details
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