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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] | Our short and long-term investments in available-for-sale securities consisted of the following (in thousands):
| As of September 30, 2021
| Amortized Cost |  | Unrealized Holding Gains (Losses) |  | Fair Value
Short-term corporate bonds | $ | 18,009 |  |  | $ | — |  |  | $ | 18,009 |
Long-term corporate bonds | 7,172 |  |  | — |  |  | 7,172 |
Total investment securities | $ | 25,181 |  |  | $ | — |  |  | $ | 25,181 |
| As of December 31, 2020
| Amortized Cost |  | Unrealized Holding Gains (Losses) |  | Fair Value
Short-term corporate bonds | $ | 14,687 |  |  | $ | — |  |  | $ | 14,687 |
Long-term corporate bonds | 12,974 |  |  | — |  |  | 12,974 |
Total investment securities | $ | 27,661 |  |  | $ | — |  |  | $ | 27,661 |
Equity Method Investments [Table Text Block] | Our non-marketable equity method investments consisted of the following (in thousands):
|  | As of September 30, 2021 |  | As of December 31, 2020
Equity method investments |  | $ | 3,250 |  |  | $ | — |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + 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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