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Balance Sheet Components (Paycheck Protection Program) (Narrative) (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 25, 2020 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |
Gain on loan extinguishment |  |  | $ 796,000 | $ 0
Notes Payable to Banks | Paycheck Protection Program |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount of debt instrument | $ 796,000 |  |  |
Term of debt instrument | 2 years |  |  |
Stated interest rate (as a percent) | 1.00% |  |  |
Period until first payment | 6 months |  |  |
Gain on loan extinguishment |  | $ 796,000 |  |

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