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General and Summary of Significant Accounting Policies Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | $ 501 | $ 4,224
Investment Securities, Amortized Cost | 501 | 4,740
Investment Securities | 501 | 4,740
Short-term investment securities | 501 | 4,224
Long-term Investment Securities | 0 | 516
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 | 501 | 2,314
Short-term investment securities | 501 | 2,314
Debt Securities, Available-for-Sale, Amortized Cost, Noncurrent | 0 | 516
Long-term Investment Securities | 0 | 516
Debt Securities, Available-for-Sale, Unrealized Loss | 0 | 0
US Treasury Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Short-term investment securities | 0 | 1,412
Debt Securities, Available-for-Sale, Unrealized Loss | 0 | 0
US Treasury Securities | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Short-term investment securities | 0 | 1,412
US Government Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 0 | 498
Short-term investment securities | 0 | 498
Debt Securities, Available-for-Sale, Unrealized Loss | $ 0 | 0
US Government Debt Securities | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Short-term investment securities |  | $ 0

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