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Revenue Recognition - Changes in Balance of Deferred Revenues (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Revenue Recognition |  |
Beginning balance | $ 28,722 | $ 72,930
Increase in deferred revenues | 14,974 | 3,474
Refunds of revenues previously deferred |  | (10,000)
Revenue recognized during the period that was included in deferred revenues at the beginning of the period | (5,757) | (30,839)
Revenue recognized from performance obligations satisfied within the same period | (1,209) | (1,356)
Ending Balance | $ 36,730 | $ 34,209

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- Definition Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in measure of progress which (increases) decreases obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 + Details
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