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REVENUE (Tables) | 6 Months Ended
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Jun. 30, 2021
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | Information regarding source of revenues:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Over time | $ | 43,502 |  |  | $ | 28,274 |  |  | $ | 83,557 |  |  | $ | 50,445 |
Point in time | 15,301 |  |  | 11,737 |  |  | 30,606 |  |  | 17,678 |
Total revenue | $ | 58,803 |  |  | $ | 40,011 |  |  | $ | 114,163 |  |  | $ | 68,123 |
Information regarding revenue by stream:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Revenues: |  |  |  |  |  |  |
Subscription | $ | 43,502 |  |  | $ | 28,274 |  |  | $ | 83,557 |  |  | $ | 50,445 |
Advertising | 9,056 |  |  | 6,808 |  |  | 18,331 |  |  | 11,816 |
Duolingo English Test | 4,833 |  |  | 4,598 |  |  | 9,868 |  |  | 5,351 |
Other (1) | 1,412 |  |  | 331 |  |  | 2,407 |  |  | 511 |
Total revenues | $ | 58,803 |  |  | $ | 40,011 |  |  | $ | 114,163 |  |  | $ | 68,123 |
________________ (1) Other revenue is mainly comprised of in app purchases of virtual goods.
Contract with Customer, Contract Asset, Contract Liability, and Receivable | Changes in deferred revenues were as follows:
| Six Months Ended June 30,
| 2021 |  | 2020
Beginning balance—January 1 | $ | 54,792 |  |  | $ | 26,307 |
Amount from beginning balance recognized into revenue | (41,498) |  |  | (19,833) |
Recognition of deferred revenue | (45,378) |  |  | (30,737) |
Deferral of revenue | 103,081 |  |  | 68,897 |
Ending balance—June 30 | $ | 70,997 |  |  | $ | 44,634 |

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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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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 + Details
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