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

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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