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General and Summary of Significant Accounting Policies Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |
Investment Securities, Amortized Cost | $ 4,740 | $ 19,040
Investment Securities | 4,740 | 19,040
Debt Securities, Available-for-Sale, Amortized Cost, Current | 4,224 |
Short-term investment securities | 4,224 | 14,420
Long-term Investment Securities | 516 | 4,620
Debt Securities, Available-for-Sale, Unrealized Loss | 0 | 0
Corporate Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 2,314 | 14,420
Short-term investment securities | 2,314 | 14,420
Debt Securities, Available-for-Sale, Amortized Cost, Noncurrent | 516 | 4,620
Long-term Investment Securities | 516 | 4,620
Debt Securities, Available-for-Sale, Unrealized Loss | 0 | $ 0
US Treasury Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Short-term investment securities | 1,412 |
Debt Securities, Available-for-Sale, Unrealized Loss | 0 |
US Government Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 498 |
Short-term investment securities | 498 |
Long-term Investment Securities | 498 |
Debt Securities, Available-for-Sale, Unrealized Loss | $ 0 |

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