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Revenue Recognition - Summary of Contract Balances (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Revenue from Contract with Customer [Abstract] |  |
Accounts receivable | $ 6,817 | $ 12,398
Obligations for refunds | 5,403 | 3,448
Deferred revenue – current | 332,783 | 274,819
Deferred revenue – non-current | $ 366,676 | $ 254,481

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