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Investment Securities Table (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 3,235 | $ 4,740 |  |
Debt Securities, Available-for-sale, Unrealized Loss | 0 | 0 |  |
Short-term investment securities | 3,235 | 4,224 | [1] |
Long-term investment securities | 0 | 516 |  |
Debt Securities, Available-for-sale | 3,235 | 4,740 |  |
Corporate Debt Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost, Current | 1,320 | 2,314 |  |
Debt Securities, Available-for-sale, Noncurrent |  | 516 |  |
Debt Securities, Available-for-sale, Unrealized Loss | 0 | 0 |  |
Short-term investment securities | 1,320 | 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 | 1,417 | 1,412 |  |
Debt Securities, Available-for-sale, Unrealized Loss | 0 | 0 |  |
Short-term investment securities | 1,417 | 1,412 |  |
US Government Debt Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost, Current | 498 | 498 |  |
Debt Securities, Available-for-sale, Unrealized Loss | 0 | 0 |  |
Short-term investment securities | $ 498 | $ 498 |  | $ 498
[1] | December 31, 2022 balances were derived from audited consolidated financial statements.

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