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Short-term investments (Tables) | 6 Months Ended
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Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract] |
Debt Securities, Available-for-Sale [Table Text Block] | Below is a summary of short-term investments, which are measured at fair value as of June 30, 2022 (in thousands):
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Corporate bonds |  | $ | 173,376 |  |  | $ | — |  |  | $ | (2,326 | ) |  | $ | 171,050 |
Asset-backed securities |  |  | 20,449 |  |  |  | — |  |  |  | (86 | ) |  |  | 20,363 |
Government securities |  |  | 2,951 |  |  |  | — |  |  |  | (17 | ) |  |  | 2,934 |
Total |  | $ | 196,776 |  |  | $ | — |  |  | $ | (2,429 | ) |  | $ | 194,347 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 + Details
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