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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] | Our short-term and long-term investments in available-for-sale securities consist of the following (in thousands):
| As of September 30, 2023
| Amortized Cost |  | Unrealized Holding Gains (Losses) |  | Fair Value
Short-term corporate bonds | 1,306 |  |  | $ | — |  |  | $ | 1,306 |
Short-term government bonds | 500 |  | — |  |  | 500 |
Total investment securities | $ | 1,806 |  |  | $ | — |  |  | $ | 1,806 |
| As of December 31, 2022
| Amortized Cost |  | Unrealized Holding Gains (Losses) |  | Fair Value
Short-term corporate bonds | $ | 2,314 |  |  | $ | — |  |  | $ | 2,314 |
Short-term U.S. treasury securities | 1,412 |  |  | — |  |  | 1,412 |
Short-term government bonds | 498 |  |  | — |  |  | 498 |
Long-term corporate bonds | 516 |  |  | — |  |  | 516 |
Total investment securities | $ | 4,740 |  |  | $ | — |  |  | $ | 4,740 |
Equity Method Investments [Table Text Block] | Our non-marketable equity method investment consists of the following (in thousands):
|  | As of
|  | September 30, 2023 |  | December 31, 2022
Equity method investment |  | $ | 3,145 |  |  | $ | 3,178 |

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 + Details
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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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