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Investment Securities Table (Details) - USD ($) $ in Thousands | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2023 | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | $ 1,806 | $ 4,740 |  |
Debt Securities, Available-for-sale, Unrealized Loss | $ 0 | 0 |  |  |
Short-term investment securities |  | 1,806 | 4,224 | [1] |
Long-term investment securities |  | 0 | 516 |  |
Debt Securities, Available-for-sale |  | 1,806 | 4,740 |  |
Corporate Debt Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost, Current |  | 1,306 | 2,314 |  |
Debt Securities, Available-for-sale, Noncurrent |  |  | 516 |  |
Debt Securities, Available-for-sale, Unrealized Loss | 0 | 0 |  |  |
Short-term investment securities |  | 1,306 | 2,314 |  |
Long-term investment securities |  |  | 516 |  |
US Treasury Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost, Current |  |  | 1,412 |  |
Debt Securities, Available-for-sale, Unrealized Loss | 0 |  |  |  |
Short-term investment securities |  |  | 1,412 |  |
US Government Debt Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost, Current |  | 500 | 498 |  |
Debt Securities, Available-for-sale, Unrealized Loss | $ 0 | 0 |  |  |
Short-term investment securities |  | $ 500 | $ 498 |  | $ 498
[1] | December 31, 2022 balances were derived from audited consolidated financial statements.

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