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Revenue recognition | 6 Months Ended
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Jun. 30, 2023
Revenue from Contract with Customer [Abstract] |
Revenue recognition | 3. Revenue recognition Deferred revenue— Revenue recognized for the three months ended June 30, 2023, from amounts included in deferred revenue as of March 31, 2023 was $135.2 million. Revenue recognized for the three months ended June 30, 2022, from amounts included in deferred revenue as of March 31, 2022 was $115.2 million. Revenue recognized for the six months ended June 30, 2023, from amounts included in deferred revenue as of December 31, 2022 was $200.5 million. R evenue recognized for the six months ended June 30, 2022, from amounts included in deferred revenue as of December 31, 2021 was $157.8 million. The below table presents a summary of deferred revenue balances by reportable segment (in thousands):
| June 30, |  | December 31, |  | December 31,
| 2023 |  | 2022 |  | 2021
Deferred revenue: |  |  |  |  |
Enterprise | $ | 229,456 |  |  | $ | 219,030 |  |  | $ | 148,966 |
Consumer | 58,069 |  |  | 59,249 |  |  | 61,588 |
Total deferred revenue | $ | 287,525 |  |  | $ | 278,279 |  |  | $ | 210,554 |
Remaining performance obligations— Remaining performance obligations represent the aggregate amount of the transaction price in contracts for performance obligations not delivered, or partially undelivered, as of the end of the reporting period. Remaining performance obligations primarily relate to unearned and unbilled revenue from multi-year Enterprise subscription contracts with future installment payments, as well as unearned revenue from Consumer single course purchases and subscriptions at the end of any given period. As of June 30, 2023, the aggregate transaction price for remaining performance obligations was $509.0 million, of which 72% is expected to be recognized over the next twelve months and the remainder thereafter. Deferred contract costs— The following table represents a rollforward of the Company’s deferred contract costs (in thousands):
| Balance at Beginning of Period |  | Additions |  | Amortization Expense |  | Balance at End of Period
Six Months Ended June 30, 2023 | $ | 65,645 |  |  | $ | 30,036 |  |  | $ | (21,829) |  |  | $ | 73,852 |
Six Months Ended June 30, 2022 | $ | 44,545 |  |  | $ | 27,381 |  |  | $ | (13,965) |  |  | $ | 57,961 |

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-9 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-10 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-15 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-13 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Topic 606 -Publisher FASB -URI https://asc.fasb.org//606/tableOfContent + Details
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