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Revenue - Deferred Contract Acquisition Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Capitalized Contract Cost [Roll Forward] |  |  |  |
Beginning balance | $ 28,171 | $ 17,846 | $ 25,184 | $ 15,940
Capitalization of contract acquisition costs | 9,672 | 4,221 | 16,158 | 8,446
Amortization of deferred contract acquisition costs | (3,963) | (2,585) | (7,462) | (4,904)
Ending balance | $ 33,880 | $ 19,482 | $ 33,880 | $ 19,482

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- Definition Capitalized Contract Cost, Additions + References No definition available. + Details
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Namespace Prefix: | cloud_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Capitalized Contract Cost + References No definition available. + Details
Name: | cloud_CapitalizedContractCostRollForward
Namespace Prefix: | cloud_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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=68051541&loc=SL49131252-203054 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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; classified as noncurrent. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant