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Summary of Significant Accounting Policies Concentration of Sales to Major Customers) (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Total revenue | $ 395 | $ 639 | $ 587 | $ 1,469 | $ 4,605 | $ 1,190 | $ 1,240 | $ 1,851 | $ 3,090 | $ 8,886
Customer Revenue Concentration |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | $ 3,000 | $ 7,700
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 97.00% | 86.00%
Second Commercial Customer |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | $ 1,200
Concentration Risk, Percentage |  |  |  |  |  |  |  |  |  | 13.00%

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