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Summary of Significant Accounting Policies - Schedule of Distribution of Total Operating Expenses by Geographical Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Operating expenses | $ 4,874 | $ 6,335 | $ 17,708 | $ 27,482
Ireland |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating expenses | 3,056 | 4,859 | 11,166 | 19,931
U.S. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating expenses | 1,817 | $ 1,476 | 6,495 | $ 7,551
Bermuda |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating expenses | $ 1 |  | $ 47 |

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