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Revenue Recognition - Deferred Revenue for Long-term (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Revenue, Remaining Performance Obligation [Roll Forward] |  |
Beginning balance - January 1 | $ 11,082 | $ 12,486
Acquired deferred revenue (Note 2) | 11,125 | 0
Recognition of deferred revenue | (19,229) | (11,005)
Deferral of revenue | 17,068 | 9,601
Ending balance - December 31 | $ 20,046 | $ 11,082

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