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Revenue, Deferred Revenue And Prepaid Commissions - Deferred Revenues (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2021 USD ($)
Contract With Customer, Asset And Liability [Roll Forward] |
Beginning balance | $ 29,796
Additions | 45,296
Revenue Recognized | (47,349)
Ending balance | $ 27,743

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- Definition Contract With Customer, Asset And Liability [Roll Forward] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Contract With Customer, Liability, Increase From Additions + References No definition available. + Details
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Namespace Prefix: | spok_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract​ With ​Customer, ​Liability, ​Revenue​ Recognized​, Including​ Opening​ Balance + References No definition available. + Details
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Namespace Prefix: | spok_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130532-203044 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant