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Leases - Additional Information (Details) ft² in Thousands, $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) ft² renewal | Dec. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items] |  |
Termination term | 1 year |
Operating lease right-of-use assets | $ 16,113 | $ 14,016
Lease liability | 17,594 |
Expected cash payments | $ 19,618 |
Building |  |
Lessee, Lease, Description [Line Items] |  |
Area of lease | ft² | 26 |
Operating lease right-of-use assets | $ 4,400 |
Lease liability | 4,400 |
Expected cash payments | $ 4,900 |
Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Number of renewal options | renewal | 1 |
Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Number of renewal options | renewal | 5 |

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- Definition Lessee, Operating Lease, Area Of Lease + References No definition available. + Details
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Namespace Prefix: | spok_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee, Operating Lease, Number Of Renewal Terms + References No definition available. + Details
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- Definition Lessee, Operating Lease, Termination Term + References No definition available. + Details
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Namespace Prefix: | spok_
Data Type: | xbrli:durationItemType
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Details
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Namespace Prefix: |
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- Details
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- Details
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