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Revenue recognition | 12 Months Ended
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Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |
Revenue recognition | Revenue recognition Deferred revenue—Revenue recognized during the fiscal year ended December 31, 2021 from amounts included in deferred revenue as of December 31, 2020 was $139.5 million. R evenue recognized during the fiscal year ended December 31, 2020 from amounts included in deferred revenue as of December 31, 2019 was $83.4 million. R evenue recognized during the fiscal year ended December 31, 2019 from amounts included in deferred revenue as of December 31, 2018 was $62.4 million. The below table presents a summary of deferred revenue balances by reportable segment (in thousands):
|  | December 31, |  | December 31,
|  | 2021 |  | 2020
Deferred revenue: |  |  |  |
Enterprise |  | $ | 148,966 |  |  | $ | 84,241 |
Consumer |  | 61,588 |  |  | 58,135 |
Total deferred revenue |  | $ | 210,554 |  |  | $ | 142,376 |
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 relate to unearned revenue from consumer single course purchase arrangements and unearned and unbilled revenue from multi-year enterprise subscription contracts with future installment payments at the end of any given period. As of December 31, 2021, the aggregate transaction price for remaining performance obligations w as $329.1 million, of wh ich 73% is expected to be recognized during 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
Year ended December 31, 2021 | 25,837 |  |  | 36,509 |  |  | (17,801) |  |  | 44,545 |
Year ended December 31, 2020 | 14,380 |  |  | 18,943 |  |  | (7,486) |  |  | 25,837 |
Year ended December 31, 2019 | 6,733 |  |  | 10,685 |  |  | (3,038) |  |  | 14,380 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 + Details
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