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Summary of Significant Accounting Policies (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) segment | Jun. 30, 2022 USD ($) | Dec. 31, 2022 USD ($)
Summary of Significant Accounting Policies |  |  |  |  |
Allowance for doubtful accounts on grants receivable | $ 0 |  | $ 0 |  |
Grant income | 6,925 | $ 6,385 | 10,351 | $ 12,289 |
Deferred grant income, current | 1,056 |  | 1,056 |  | $ 1,702
Deferred grant income, noncurrent | 1,052 |  | 1,052 |  | 1,686
Unrecognized income tax | $ 0 |  | $ 0 |  | $ 0
Expected dividend yield |  |  | 0.00% | 0.00% |
Number of operating segments | segment |  |  | 1 |  |

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- Definition Amount of allowance for credit loss on grants receivable, classified as current. + References No definition available. + Details
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- Definition The amount of current portion of deferred grant income as at the end of the reporting period. + References No definition available. + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8672-108599 + Details
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