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Revenue Recognition - Contract Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Capitalized Contract Cost [Line Items] |  |  |  |  |
Contract cost amortization |  |  | $ 9,928 | $ 15,937 |
Capitalized contract cost, amortization period | 5 years |  | 5 years |  |
Bonuses and Commissions |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Contract cost assets |  |  |  |  | $ 3,300
Contract cost amortization | $ 300 | $ 400 | $ 1,300 | 1,300 |
Contract Fulfillment Costs |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Contract cost assets | 21,900 |  | 21,900 |  | $ 23,400
Contract cost amortization | $ 1,300 | $ 5,200 | $ 8,600 | $ 14,600 |

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123353750&loc=SL49131252-203054 + Details
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- Definition Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123353750&loc=SL49131251-203054 + Details
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123353750&loc=SL49131252-203054 + Details
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