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Summary of Significant Accounting Policies - Short-Term Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Summary of Significant Accounting Policies |  |
Short-term investments at cost | $ 2,606 | $ 0
Unrealized holding gains | 4 | 0
Fair value of short-term investments | $ 2,610 | $ 0

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