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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2021
Revenue from Contract with Customer [Abstract] |
Changes in Deferred Revenue | The following table presents changes in the deferred revenue balance as of June 30:
| 2021 |  | 2020
Balance as of January 1 | $ | 101,542 |  |  | $ | 121,339 |
Deferral of revenue | 131,895 |  |  | 103,542 |
Recognition of deferred revenue | (105,590) |  |  | (121,273) |
Balance as of June 30 | $ | 127,847 |  |  | $ | 103,608 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 + Details
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- References No definition available. + Details
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