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Investment Securities (Tables) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract] |  |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] | As of June 30, 2024, we did not have any investment securities. As of December 31, 2023, the amortized cost, unrealized holding gains (losses) and fair value of our available-for-sale investment securities were as follows (in thousands):
| As of December 31, 2023
| Amortized Cost |  | Unrealized Holding Gains (Losses) |  | Fair Value
Short-term corporate bonds | $ | 501 |  |  | $ | — |  |  | $ | 501 |
Equity Method Investments [Table Text Block] |  | Our non-marketable equity method investment consists of the following (in thousands):
|  | As of
|  | June 30, 2024 |  | December 31, 2023
Equity method investment |  | $ | 3,091 |  |  | $ | 3,120 |

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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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