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Summary of Significant Accounting Policies (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 01, 2021 | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) segment | Sep. 30, 2020 USD ($)
Summary of Significant Accounting Policies |  |  |  |  |
Allowance for doubtful accounts on grants receivable |  | $ 0 |  | $ 0 |
Allowance for doubtful accounts on other receivables |  | 0 |  | 0 |
Deferred offering costs incurred during the period |  | 769 | $ 0 | 3,210 | $ 0
Grant income |  | 3,037 | 3,192 | $ 12,375 | $ 8,146
Expected dividend yield |  |  |  | 0.00% | 0.00%
Other comprehensive (loss) gain related to foreign currency translation |  | $ (3) | $ 18 | $ (9) | $ (40)
Number of operating segments | segment |  |  |  | 1 |
Subsequent Event |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |
Stock split ratio | 0.3092 |  |  |  |
Minimum |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |
Useful life of property and equipment |  |  |  | 5 years |
Maximum |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |
Useful life of property and equipment |  |  |  | 6 years |

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