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Income Taxes - Schedule of Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Deferred tax assets: |  |  |
Deferred revenue on unredeemed observatory admission ticket sales | $ 256 | $ 916 | $ 1,396
New York City net operating loss carryforward credit | 334 | 0 | 0
Deferred tax assets | $ 590 | $ 916 | $ 1,396

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